feat(ui): content-measured History columns, shared caption widths, settings_view split

Stage 5: generalize logColumnWidth into textColumnWidth so History's
Trigger/Job/State/Detail/Log columns size from measured text instead of
pixel constants that clipped at larger text sizes (F6, F14).

Stage 6: captionColumnWidth replaces detailCaptionWidth and
settingsLabelWidth with one theme-derived helper; jobs_view_details.go
now builds its metadata rows and their width from a single
metadataRows() list instead of two hand-kept ones (F10); the Settings
button row drops its transparent-rectangle spacers for a
CustomPaddedLayout (F8); the remaining eight fyne.TextTruncate call
sites move to the non-deprecated Truncation field (N1).

Stage 7: settings_view.go split into settings_view.go (field
construction/save/load/validate), settings_view_layout.go (the
two-column layout and settingsSection/settingsRow), and
settings_view_helpers.go (fyneVersion, dialogs, path helpers),
mirroring the jobs_view.go split. Along the way, Queue/Storage's inline
VBox and Application/About's settingsSection collapse into one
settingsSection(title, spacing, rows...) constructor, and
chooseFile/chooseJSONFile merge into one function with a filter
argument.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/ARCHITECTURE.md

@@ -213,3 +213,14 @@ size guideline:
 | `jobs_view.go` | `newJobsView` — list, toolbar, button wiring, and layout |
 | `jobs_view_details.go` | `detailsPanel` struct — widget creation, `update`, `clear`, `container` |
 | `jobs_view_helpers.go` | Pure helpers — `filteredJobIndexes`, `folderOptions`, `filterValue`, `indexOfID`, `lastJobLogs`, `nextJobListView`, `viewToggleText` |
+
+### `settings_view.go` file structure
+
+`src/ui/settings_view.go` is split across three files the same way, once its
+own size passed the ~250-line guideline:
+
+| File | Contents |
+|------|----------|
+| `settings_view.go` | `settingsView` — field construction, save, load, validate; the Theme label translation helpers |
+| `settings_view_layout.go` | `newSettingsLayout`, `settingsSection`, `settingsRow` — the two-column arrangement and the button row |
+| `settings_view_helpers.go` | Pure helpers — `fyneVersion`, `mustParseURL`, `settingsFolderPath`, `openFolder`, `chooseFile`/`chooseJSONFile`, `chooseFolder` (`chooseFile` also backs `job_dialog.go`'s command browser) |

src/ui/history_view.go

@@ -42,37 +42,85 @@ func collectActivity(jobs []job, runtimes map[int]*domain.JobRuntime) []event {
 	return events
 }
 
-// logColumnMinWidth/logColumnMaxWidth bound the dynamically sized Log column.
-// The minimum keeps the column readable when names are short or absent; the
-// maximum stops a single very long file name from dominating the table (the
-// table still scrolls horizontally past it).
-const (
-	logColumnMinWidth = 240
-	logColumnMaxWidth = 520
-	logColumnPadding  = 24
-)
+// textWidth measures how wide s renders at the theme's current body text size.
+func textWidth(s string) float32 {
+	return fyne.MeasureText(s, theme.TextSize(), fyne.TextStyle{}).Width
+}
 
-// logColumnWidth measures the widest Log cell value so the column can be sized
-// to fit its content. Fyne tables do not auto-size columns, so without this the
-// fixed width clips file names like "20260601-100000_SomeJobName.log".
-func logColumnWidth(events []event) float32 {
-	width := float32(logColumnMinWidth)
-	for _, current := range events {
-		text := logFileName(current.LogFile)
+// cellPadding is the horizontal space a table cell reserves around its text.
+// It replaces a hand-tuned pixel constant with the theme's own inner padding
+// doubled (one side each), so it follows text size and DPI.
+func cellPadding() float32 { return 2 * theme.InnerPadding() }
+
+// textColumnMinWidth/textColumnMaxWidth bound every content-measured History
+// column: the minimum keeps a column readable when its values are short or
+// absent, the maximum stops one very long value from dominating the table
+// (the table still scrolls horizontally past it). Expressed as measured text
+// rather than raw pixels so both follow the theme instead of drifting from it.
+func textColumnMinWidth() float32 { return textWidth(strings.Repeat("0", 10)) + cellPadding() }
+func textColumnMaxWidth() float32 { return textWidth(strings.Repeat("0", 30)) + cellPadding() }
+
+// textColumnWidth measures the widest of samples so a table column can be
+// sized to fit its content, clamped to [min, max]. Fyne tables do not
+// auto-size columns, so without this a fixed width clips values like
+// "20260601-100000_SomeJobName.log" in the Log column.
+func textColumnWidth(samples []string, min, max float32) float32 {
+	width := min
+	for _, text := range samples {
 		if text == "" {
 			continue
 		}
-		w := fyne.MeasureText(text, theme.TextSize(), fyne.TextStyle{}).Width + logColumnPadding
-		if w > width {
+		if w := textWidth(text) + cellPadding(); w > width {
 			width = w
 		}
 	}
-	if width > logColumnMaxWidth {
-		width = logColumnMaxWidth
+	if width > max {
+		width = max
 	}
 	return width
 }
 
+// historyTriggerSamples is the closed set of Trigger values History ever
+// shows (see newEvent and app.operations.go/app.run.go, which produce "UI",
+// "Manual" and "Schedule"; historyCellText falls back to "Unknown"). Add a new
+// trigger here too if one is introduced there, or the column may clip it.
+var historyTriggerSamples = []string{"Schedule", "Manual", "UI", "Unknown"}
+
+// historyStateSamples is the closed set of State values History ever shows:
+// "OK" and "Failed" come from runner.RunJob (runStateDetail/startJobOnly);
+// "Started", "Error" and "Jobs loaded" are recorded directly in mainwindow.go.
+// Add a new state here too if one is introduced in either place.
+var historyStateSamples = []string{"OK", "Failed", "Started", "Error", "Jobs loaded"}
+
+// historyTimeSample is the rendered form of the timestamp layout every event
+// uses (see newEvent), so the Time column needs no content scan: its width is
+// fixed by the format string.
+const historyTimeSample = "2026-01-02 15:04:05"
+
+// historyColumnWidths computes every column's width from the current sorted
+// rows. Time, Trigger and State are fixed-shape or closed-set columns; Job,
+// Detail and Log are free text, so their width tracks the values actually
+// present, bounded the same way the Log column always was.
+func historyColumnWidths(rows []event) [6]float32 {
+	jobNames := make([]string, 0, len(rows))
+	details := make([]string, 0, len(rows))
+	logNames := make([]string, 0, len(rows))
+	for _, current := range rows {
+		jobNames = append(jobNames, current.JobName)
+		details = append(details, current.Detail)
+		logNames = append(logNames, logFileName(current.LogFile))
+	}
+	min, max := textColumnMinWidth(), textColumnMaxWidth()
+	return [6]float32{
+		textWidth(historyTimeSample) + cellPadding(),
+		textColumnWidth(historyTriggerSamples, min, max),
+		textColumnWidth(jobNames, min, max),
+		textColumnWidth(historyStateSamples, min, max),
+		textColumnWidth(details, min, max),
+		textColumnWidth(logNames, min, max),
+	}
+}
+
 // historyHeader is a bold tappable label used in the History table header row.
 // In Fyne 2.7+ OnSelected is not fired for header cells (Row < 0), so the sort
 // toggle is wired through the Tappable interface instead.
@@ -85,7 +133,7 @@ type historyHeader struct {
 func newHistoryHeader() *historyHeader {
 	h := &historyHeader{label: widget.NewLabel("")}
 	h.label.TextStyle = fyne.TextStyle{Bold: true}
-	h.label.Wrapping = fyne.TextTruncate
+	h.label.Truncation = fyne.TextTruncateClip
 	h.ExtendBaseWidget(h)
 	return h
 }
@@ -147,7 +195,7 @@ func newHistoryView(events *[]event) (*fyne.Container, func()) {
 		},
 		func() fyne.CanvasObject {
 			label := widget.NewLabel("")
-			label.Wrapping = fyne.TextTruncate
+			label.Truncation = fyne.TextTruncateClip
 			return label
 		},
 		func(id widget.TableCellID, item fyne.CanvasObject) {
@@ -175,20 +223,20 @@ func newHistoryView(events *[]event) (*fyne.Container, func()) {
 	table.OnSelected = func(id widget.TableCellID) {
 		table.Unselect(id)
 	}
-	table.SetColumnWidth(0, 150)
-	table.SetColumnWidth(1, 90)
-	table.SetColumnWidth(2, 170)
-	table.SetColumnWidth(3, 90)
-	table.SetColumnWidth(4, 260)
-	table.SetColumnWidth(5, logColumnWidth(*events))
+	setColumnWidths := func() {
+		for col, width := range historyColumnWidths(rows) {
+			table.SetColumnWidth(col, width)
+		}
+	}
+	setColumnWidths()
 
 	// refresh re-reads the event list into the sorted snapshot and recomputes
-	// the content-fit Log column width before redrawing, so newly recorded
-	// events appear in the current sort order and longer file names widen the
-	// column instead of being truncated.
+	// every content-fit column width before redrawing, so newly recorded events
+	// appear in the current sort order and longer values widen their column
+	// instead of being truncated.
 	refresh := func() {
 		resort()
-		table.SetColumnWidth(5, logColumnWidth(*events))
+		setColumnWidths()
 		table.Refresh()
 	}
 	return container.NewPadded(table), refresh

src/ui/history_view_test.go

@@ -1,6 +1,7 @@
 package ui
 
 import (
+	"strings"
 	"testing"
 	"time"
 
@@ -218,6 +219,79 @@ func TestHistoryCellTemplateIsPlainText(t *testing.T) {
 	}
 }
 
+// TestTextColumnWidthClamps covers the three shapes textColumnWidth has to
+// handle: a sample narrower than min, one that lands between the bounds, and
+// one wide enough to hit the max cap.
+func TestTextColumnWidthClamps(t *testing.T) {
+	testApp := test.NewApp()
+	defer testApp.Quit()
+
+	min, max := float32(50), float32(120)
+	if got := textColumnWidth([]string{"x"}, min, max); got != min {
+		t.Errorf("below-min sample: got %v, want the floor %v", got, min)
+	}
+	inRange := textWidth("mid-sized value") + cellPadding()
+	if inRange <= min || inRange >= max {
+		t.Skip("fixture sample no longer lands strictly between the bounds under this theme")
+	}
+	if got := textColumnWidth([]string{"mid-sized value"}, min, max); got != inRange {
+		t.Errorf("in-range sample: got %v, want %v", got, inRange)
+	}
+	if got := textColumnWidth([]string{strings.Repeat("0", 200)}, min, max); got != max {
+		t.Errorf("above-max sample: got %v, want the cap %v", got, max)
+	}
+	if got := textColumnWidth(nil, min, max); got != min {
+		t.Errorf("no samples: got %v, want the floor %v", got, min)
+	}
+}
+
+// TestHistoryColumnsFitTheirContent guards F6/F14: every column must be at
+// least as wide as its widest known or actually-present value, at the default
+// theme and at a scaled one, so nothing that used to be a pixel constant
+// clips again.
+func TestHistoryColumnsFitTheirContent(t *testing.T) {
+	testApp := test.NewApp()
+	defer testApp.Quit()
+
+	rows := []event{
+		{
+			Time:    "2026-06-01 12:00:00",
+			Trigger: "Schedule",
+			JobName: "A moderately long job name for width testing",
+			State:   "Jobs loaded",
+			Detail:  "A somewhat longer detail message describing what happened",
+			LogFile: `/logs/20260601-120000_SomeJobName.log`,
+		},
+	}
+
+	check := func(when string) {
+		t.Helper()
+		widths := historyColumnWidths(rows)
+		samples := [][]string{
+			{historyTimeSample},
+			historyTriggerSamples,
+			{rows[0].JobName},
+			historyStateSamples,
+			{rows[0].Detail},
+			{logFileName(rows[0].LogFile)},
+		}
+		min, max := textColumnMinWidth(), textColumnMaxWidth()
+		for col, colSamples := range samples {
+			want := textColumnWidth(colSamples, min, max)
+			if col == 0 {
+				want = textWidth(historyTimeSample) + cellPadding()
+			}
+			if widths[col] < want {
+				t.Errorf("%s: column %d width = %v, want at least %v", when, col, widths[col], want)
+			}
+		}
+	}
+
+	check("default theme")
+	testApp.Settings().SetTheme(test.NewTheme())
+	check("scaled theme")
+}
+
 func TestNewEventUsesConsistentTimestampShape(t *testing.T) {
 	ev := newEvent(1, "Job", "OK", "detail")
 	if _, err := time.Parse("2006-01-02 15:04:05", ev.Time); err != nil {

src/ui/job_dialog.go

@@ -35,7 +35,7 @@ func showJobDialog(w fyne.Window, title string, current job, onSave func(job)) {
 	commandEntry.SetPlaceHolder(`C:\Program Files\App\App.exe`)
 	commandEntry.SetText(current.Command)
 	commandBrowse := widget.NewButtonWithIcon("Browse", theme.FolderOpenIcon(), func() {
-		chooseFile(w, commandEntry)
+		chooseFile(w, commandEntry, nil)
 	})
 	commandRow := container.NewBorder(nil, nil, nil, commandBrowse, commandEntry)
 	argumentsEntry := widget.NewMultiLineEntry()

src/ui/jobs_view_details.go

@@ -65,7 +65,7 @@ func newDetailsPanel(firstJob job, rt *domain.JobRuntime, globalOverlapPolicy do
 		func() int { return len(d.selectedLogs) },
 		func() fyne.CanvasObject {
 			l := widget.NewLabel("log")
-			l.Wrapping = fyne.TextTruncate
+			l.Truncation = fyne.TextTruncateClip
 			return l
 		},
 		func(id widget.ListItemID, item fyne.CanvasObject) {
@@ -115,21 +115,59 @@ func (d *detailsPanel) clear() {
 	d.logs.Refresh()
 }
 
+// detailRowSpec pairs a metadata caption with the widget that shows its value.
+// metadataRows and container derive both the caption column width and the row
+// layout from this single list, so a row added to one is never forgotten in
+// the other.
+type detailRowSpec struct {
+	caption string
+	value   fyne.CanvasObject
+}
+
+// metadataRows lists the details pane's metadata rows in display order. It is
+// the single source both the caption width measurement and the row layout in
+// container() read, so a twelfth row added here cannot silently go unmeasured
+// or unlaid-out the way two separately maintained lists could.
+func (d *detailsPanel) metadataRows() []detailRowSpec {
+	return []detailRowSpec{
+		{"Folder", d.folder},
+		{"Schedule", d.schedule},
+		{"Command", d.command},
+		{"Arguments", d.arguments},
+		{"Run mode", d.runMode},
+		{"Overlap policy", d.overlapPolicy},
+		{"Timeout", d.timeout},
+		{"State", d.state},
+		{"Last run", d.lastRun},
+		{"Next run", d.nextRun},
+		{"Statistics", d.stats},
+	}
+}
+
 // container assembles the details pane layout: metadata rows pin to the top,
 // the activity panel pins to the bottom, and command output fills the remainder.
 func (d *detailsPanel) container() fyne.CanvasObject {
 	// Metadata is laid out in two columns so the block stays half as tall,
 	// keeping the details pane usable on 720p screens where a single column of
 	// ten rows pushes the minimum window height past the available space.
-	capW := detailCaptionWidth()
-	rows := container.New(layout.NewCustomPaddedVBoxLayout(rowOverlap()),
-		detailRowPair(capW, "Folder", d.folder, "Schedule", d.schedule),
-		detailRowPair(capW, "Command", d.command, "Arguments", d.arguments),
-		detailRowPair(capW, "Run mode", d.runMode, "Overlap policy", d.overlapPolicy),
-		detailRowPair(capW, "Timeout", d.timeout, "State", d.state),
-		detailRowPair(capW, "Last run", d.lastRun, "Next run", d.nextRun),
-		detailRow(capW, "Statistics", d.stats),
-	)
+	specs := d.metadataRows()
+	captions := make([]string, len(specs))
+	for i, spec := range specs {
+		captions[i] = spec.caption
+	}
+	capW := captionColumnWidth(captions...)
+	rowObjects := make([]fyne.CanvasObject, 0, (len(specs)+1)/2)
+	for i := 0; i+1 < len(specs); i += 2 {
+		rowObjects = append(rowObjects, detailRowPair(capW, specs[i].caption, specs[i].value, specs[i+1].caption, specs[i+1].value))
+	}
+	// An odd row count leaves one caption without a partner (Statistics, today);
+	// it falls through to a single-column row rather than being paired with
+	// nothing.
+	if len(specs)%2 == 1 {
+		last := specs[len(specs)-1]
+		rowObjects = append(rowObjects, detailRow(capW, last.caption, last.value))
+	}
+	rows := container.New(layout.NewCustomPaddedVBoxLayout(rowOverlap()), rowObjects...)
 	top := container.NewVBox(
 		d.title,
 		widget.NewSeparator(),
@@ -153,30 +191,12 @@ func (d *detailsPanel) container() fyne.CanvasObject {
 // absorbs sub-pixel rounding so the last row is never clipped behind a scrollbar.
 func activityRowsHeight(rows int) float32 {
 	sample := widget.NewLabel("log")
-	sample.Wrapping = fyne.TextTruncate
+	sample.Truncation = fyne.TextTruncateClip
 	itemHeight := sample.MinSize().Height
 	padding := theme.Padding()
 	return (itemHeight+padding)*float32(rows) - padding + 1
 }
 
-// detailCaptionWidth returns the width reserved for every metadata caption,
-// derived from the widest caption label so the value columns all start at the
-// same x and no caption truncates. Measuring a real label keeps it DPI- and
-// theme-aware instead of relying on a hand-tuned constant.
-func detailCaptionWidth() float32 {
-	captions := []string{
-		"Folder", "Schedule", "Command", "Arguments", "Run mode",
-		"Overlap policy", "Timeout", "Last run", "Next run", "State", "Statistics",
-	}
-	var width float32
-	for _, c := range captions {
-		if w := widget.NewLabelWithStyle(c, fyne.TextAlignLeading, fyne.TextStyle{Bold: true}).MinSize().Width; w > width {
-			width = w
-		}
-	}
-	return width
-}
-
 // detailRowPair places two label/value pairs side by side, producing the
 // four-column caption|value|caption|value rows the compact metadata grid uses.
 func detailRowPair(captionWidth float32, l1 string, v1 fyne.CanvasObject, l2 string, v2 fyne.CanvasObject) fyne.CanvasObject {
@@ -185,7 +205,7 @@ func detailRowPair(captionWidth float32, l1 string, v1 fyne.CanvasObject, l2 str
 
 func detailRow(captionWidth float32, label string, value fyne.CanvasObject) fyne.CanvasObject {
 	caption := widget.NewLabelWithStyle(label, fyne.TextAlignLeading, fyne.TextStyle{Bold: true})
-	caption.Wrapping = fyne.TextTruncate
+	caption.Truncation = fyne.TextTruncateClip
 	// A fixed caption width (rather than an even split) means widening the window
 	// feeds the extra space to the value, not the short caption.
 	return container.New(captionValueLayout{captionWidth: captionWidth}, caption, value)
@@ -193,6 +213,6 @@ func detailRow(captionWidth float32, label string, value fyne.CanvasObject) fyne
 
 func newJobDetailLabel(text string) *widget.Label {
 	label := widget.NewLabel(text)
-	label.Wrapping = fyne.TextTruncate
+	label.Truncation = fyne.TextTruncateClip
 	return label
 }

src/ui/jobs_view_test.go

@@ -35,8 +35,8 @@ func TestFolderOptionsAlwaysIncludesSentinels(t *testing.T) {
 func TestFolderOptionsAppendsUniqueFolders(t *testing.T) {
 	jobs := []domain.Job{
 		{Folder: "Maintenance"},
-		{Folder: ""},           // no folder → not a named folder
-		{Folder: "  Backups "}, // trimmed to "Backups"
+		{Folder: ""},            // no folder → not a named folder
+		{Folder: "  Backups "},  // trimmed to "Backups"
 		{Folder: "Maintenance"}, // duplicate → not added again
 	}
 	opts := folderOptions(jobs)
@@ -412,6 +412,29 @@ func TestToolbarButtonRedrawsRowAndDetails(t *testing.T) {
 	}
 }
 
+// TestDetailCaptionWidthCoversEveryCaption is the guard that makes the single
+// metadataRows list self-enforcing (F10): every caption it returns must
+// measure no wider than captionColumnWidth's result for that same list, or a
+// row added to metadataRows without updating the width measurement would
+// silently truncate.
+func TestDetailCaptionWidthCoversEveryCaption(t *testing.T) {
+	testApp := test.NewApp()
+	defer testApp.Quit()
+
+	d := newDetailsPanel(job{}, &domain.JobRuntime{}, domain.OverlapPolicySkip, 0)
+	specs := d.metadataRows()
+	captions := make([]string, len(specs))
+	for i, spec := range specs {
+		captions[i] = spec.caption
+	}
+	capW := captionColumnWidth(captions...)
+	for _, c := range captions {
+		if w := widget.NewLabelWithStyle(c, fyne.TextAlignLeading, fyne.TextStyle{Bold: true}).MinSize().Width; w > capW {
+			t.Errorf("caption %q measures %v, wider than captionColumnWidth's %v", c, w, capW)
+		}
+	}
+}
+
 func TestViewToggleTextNamesTheAction(t *testing.T) {
 	cases := []struct {
 		current domain.JobListView

src/ui/layout.go

@@ -3,8 +3,22 @@ package ui
 import (
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
 )
 
+// captionColumnWidth returns the width to reserve for a column of bold
+// captions: the widest of them, measured under the current theme so it tracks
+// text size and DPI instead of a hand-tuned constant.
+func captionColumnWidth(captions ...string) float32 {
+	var width float32
+	for _, caption := range captions {
+		if w := widget.NewLabelWithStyle(caption, fyne.TextAlignLeading, fyne.TextStyle{Bold: true}).MinSize().Width; w > width {
+			width = w
+		}
+	}
+	return width
+}
+
 type minWidthLayout struct {
 	width float32
 }
@@ -84,6 +98,10 @@ type captionValueLayout struct {
 	captionWidth float32
 }
 
+// MinSize and Layout both return silently when given anything but two
+// objects. That is acceptable here because the type is package-private with a
+// single constructor (detailRow), which always supplies exactly a caption and
+// a value — there is no external caller that could pass the wrong count.
 func (l captionValueLayout) MinSize(objects []fyne.CanvasObject) fyne.Size {
 	if len(objects) != 2 {
 		return fyne.Size{}

src/ui/layout_test.go

@@ -26,3 +26,27 @@ func TestRowOverlapMatchesInnerPadding(t *testing.T) {
 		t.Errorf("under a different theme, rowOverlap() = %v, want %v", got, want)
 	}
 }
+
+// TestCaptionColumnWidth covers the shapes F10's shared helper has to handle:
+// no captions, one, and several of varying length at two text sizes.
+func TestCaptionColumnWidth(t *testing.T) {
+	testApp := test.NewApp()
+	defer testApp.Quit()
+
+	if got := captionColumnWidth(); got != 0 {
+		t.Errorf("no captions: got %v, want 0", got)
+	}
+	solo := captionColumnWidth("Solo")
+	if solo <= 0 {
+		t.Errorf("one caption: got %v, want > 0", solo)
+	}
+	widest := captionColumnWidth("Short", "A Much Longer Caption")
+	if widest <= solo {
+		t.Errorf("widest of several captions = %v, want it wider than a single short one (%v)", widest, solo)
+	}
+
+	testApp.Settings().SetTheme(test.NewTheme())
+	if got := captionColumnWidth("Short", "A Much Longer Caption"); got <= 0 {
+		t.Errorf("under a different theme: got %v, want > 0", got)
+	}
+}

src/ui/settings_view.go

@@ -1,35 +1,31 @@
 package ui
 
 import (
-	"errors"
-	"image/color"
-	"net/url"
-	"runtime"
-	"runtime/debug"
 	"strconv"
 	"strings"
 
 	"gitea.mixdep.ru/mix/gosentry/src/app"
 	"gitea.mixdep.ru/mix/gosentry/src/domain"
-	"gitea.mixdep.ru/mix/gosentry/src/platform/filemanager"
-	"gitea.mixdep.ru/mix/gosentry/src/storage"
 
 	"fyne.io/fyne/v2"
-	"fyne.io/fyne/v2/canvas"
-	"fyne.io/fyne/v2/container"
-	"fyne.io/fyne/v2/dialog"
-	"fyne.io/fyne/v2/layout"
-	fynestorage "fyne.io/fyne/v2/storage"
 	"fyne.io/fyne/v2/theme"
 	"fyne.io/fyne/v2/widget"
 )
 
-// settingsLabelWidth is wide enough to show the longest caption ("Default
-// overlap policy") in full; the captions truncate, so a narrower width would
-// clip it. All rows share this width so their value controls stay aligned.
-const settingsLabelWidth float32 = 180
 const projectRepositoryURL = "https://gitea.mixdep.ru/mix/gosentry"
 
+// settingsCaptions lists every settingsRow caption in the tab, in no
+// particular order. settingsView measures this once with captionColumnWidth
+// so every row's value column starts at the same x; a caption added to a row
+// below without being added here is the one way a row would silently fall out
+// of alignment.
+var settingsCaptions = []string{
+	"Autostart", "Tray", "Notifications", "Theme",
+	"Execution mode", "Default overlap policy", "Default timeout (s)",
+	"Config JSON", "Jobs file", "Logs directory", "Max log files", "Max log age days",
+	"GoSentry", "Go", "Fyne", "Repository",
+}
+
 func settingsView(w fyne.Window, svc *app.Service) fyne.CanvasObject {
 	store := svc.Store()
 	// updateSaveState compares the form to the saved config and enables Save only
@@ -120,7 +116,7 @@ func settingsView(w fyne.Window, svc *app.Service) fyne.CanvasObject {
 	// Autostart status sits on its own row beneath the checkbox (rather than
 	// beside it) so the Application section fits within a half-width column.
 	// Truncating keeps a long status message from forcing the column wider.
-	autostartStatus.Wrapping = fyne.TextTruncate
+	autostartStatus.Truncation = fyne.TextTruncateClip
 	settingsStatus := widget.NewLabel("")
 
 	saveSettings := widget.NewButtonWithIcon("Save settings", theme.DocumentSaveIcon(), func() {
@@ -234,184 +230,28 @@ func settingsView(w fyne.Window, svc *app.Service) fyne.CanvasObject {
 		loadFields(domain.DefaultConfig())
 	})
 
-	// The form is split into two columns so a wide window uses its horizontal
-	// space instead of stretching into one tall strip. The left column holds the
-	// toggles (Application, Queue); the right holds the editable Storage fields and
-	// the read-only About block. Save spans the full width below both columns.
-	leftColumn := container.NewVBox(
-		settingsSection("Application",
-			settingsRow("Autostart", startOnLogin),
-			// Autostart status sits on its own row, aligned under the checkbox via an
-			// empty caption, so the Application section fits in a half-width column.
-			settingsRow("", autostartStatus),
-			settingsRow("Tray", minimizeToTray),
-			settingsRow("Notifications", notifications),
-			settingsRow("Theme", themeSelect),
-		),
-		widget.NewSeparator(),
-		// Queue holds the execution mode and overlap policy comboboxes. Like
-		// Storage, it uses the default VBox spacing (not the condensed section
-		// layout) so the comboboxes keep a visible gap between them.
-		container.NewVBox(
-			widget.NewLabelWithStyle("Queue", fyne.TextAlignLeading, fyne.TextStyle{Bold: true}),
-			settingsRow("Execution mode", executionModeSelect),
-			settingsRow("Default overlap policy", overlapPolicySelect),
-			settingsRow("Default timeout (s)", defaultTimeout),
-		),
-	)
-	// Truncating keeps a long config path from forcing the Settings tab's
-	// minimum width to track the path length instead of the layout itself.
-	configPathLabel := widget.NewLabel(store.Paths.ConfigPath)
-	configPathLabel.Truncation = fyne.TextTruncateClip
-	rightColumn := container.NewVBox(
-		// Storage holds editable entry fields. It uses the default VBox spacing
-		// (not the condensed section layout) so the entry boxes keep a visible
-		// gap between them instead of merging into one block.
-		container.NewVBox(
-			widget.NewLabelWithStyle("Storage", fyne.TextAlignLeading, fyne.TextStyle{Bold: true}),
-			settingsRow("Config JSON", configPathLabel),
-			settingsRow("Jobs file", container.NewBorder(nil, nil, nil, jobsFileBrowse, jobsFile)),
-			// Browse stays rightmost so it lines up with the Jobs file row
-			// above it; Open sits between it and the path it opens.
-			settingsRow("Logs directory", container.NewBorder(nil, nil, nil, container.NewHBox(logsDirOpen, logsDirBrowse), logsDir)),
-			settingsRow("Max log files", maxLogFiles),
-			settingsRow("Max log age days", maxLogAgeDays),
-		),
-		widget.NewSeparator(),
-		settingsSection("About",
-			settingsRow("GoSentry", widget.NewLabel(app.Version)),
-			settingsRow("Go", widget.NewLabel(runtime.Version())),
-			settingsRow("Fyne", widget.NewLabel(fyneVersion())),
-			settingsRow("Repository", widget.NewHyperlink(projectRepositoryURL, mustParseURL(projectRepositoryURL))),
-		),
-	)
-
-	// The two columns sit in a top-aligned grid; Save spans the full width below.
-	// Wrapping the whole thing in a vertical scroll keeps its minimum height small
-	// so it does not dictate the window's minimum height (AppTabs sizes to the
-	// tallest tab) and it scrolls on short 720p screens.
-	// The button row sits right below the separator's hairline, which reads as
-	// tighter than the other vertical gaps in the tab (those separate whole
-	// sections, not a single thin line from a row of buttons). A spacer the
-	// height of the default padding closes that gap up to match, and a matching
-	// width spacer indents the buttons from the left edge the same amount.
-	buttonRowSpacer := canvas.NewRectangle(color.Transparent)
-	buttonRowSpacer.SetMinSize(fyne.NewSize(0, theme.Padding()))
-	buttonRowLeftInset := canvas.NewRectangle(color.Transparent)
-	buttonRowLeftInset.SetMinSize(fyne.NewSize(theme.Padding(), 0))
-
-	return container.NewVScroll(container.NewPadded(container.NewVBox(
-		container.NewGridWithColumns(2, leftColumn, rightColumn),
-		widget.NewSeparator(),
-		buttonRowSpacer,
-		// Save/Cancel/Defaults share one row with the status so an empty status
-		// (the common case) does not leave a blank line above the separator. The
-		// status appears beside the buttons once a save reports a result.
-		container.NewHBox(buttonRowLeftInset, saveSettings, cancelSettings, restoreDefaults, settingsStatus),
-	)))
-}
-
-// settingsSection groups a bold header above its rows using the tight
-// rowOverlap spacing so a block of label rows reads as one compact unit. The
-// caller keeps separators and entry-heavy sections in the surrounding VBox so
-// they retain the theme's normal spacing.
-func settingsSection(title string, rows ...fyne.CanvasObject) fyne.CanvasObject {
-	children := make([]fyne.CanvasObject, 0, len(rows)+1)
-	children = append(children, widget.NewLabelWithStyle(title, fyne.TextAlignLeading, fyne.TextStyle{Bold: true}))
-	children = append(children, rows...)
-	return container.New(layout.NewCustomPaddedVBoxLayout(rowOverlap()), children...)
-}
-
-func fyneVersion() string {
-	info, ok := debug.ReadBuildInfo()
-	if !ok {
-		return "unknown"
-	}
-	for _, dependency := range info.Deps {
-		if dependency.Path == "fyne.io/fyne/v2" {
-			if dependency.Replace != nil && dependency.Replace.Version != "" {
-				return dependency.Replace.Version
-			}
-			if dependency.Version != "" {
-				return dependency.Version
-			}
-			return "local"
-		}
-	}
-	return "unknown"
-}
-
-func mustParseURL(raw string) *url.URL {
-	parsed, err := url.Parse(raw)
-	if err != nil {
-		return &url.URL{}
-	}
-	return parsed
-}
-
-func chooseFile(w fyne.Window, target *widget.Entry) {
-	fileDialog := dialog.NewFileOpen(func(uri fyne.URIReadCloser, err error) {
-		if err != nil || uri == nil {
-			return
-		}
-		target.SetText(uri.URI().Path())
-	}, w)
-	fileDialog.Resize(fyne.NewSize(900, 640))
-	fileDialog.Show()
-}
-
-// chooseJSONFile is chooseFile restricted to .json files, used for the jobs
-// file so the picker does not list every file in the folder. The entry stays
-// editable, which is how a path to a file that does not exist yet is entered.
-func chooseJSONFile(w fyne.Window, target *widget.Entry) {
-	fileDialog := dialog.NewFileOpen(func(uri fyne.URIReadCloser, err error) {
-		if err != nil || uri == nil {
-			return
-		}
-		target.SetText(uri.URI().Path())
-	}, w)
-	fileDialog.SetFilter(fynestorage.NewExtensionFileFilter([]string{".json"}))
-	fileDialog.Resize(fyne.NewSize(900, 640))
-	fileDialog.Show()
-}
-
-func chooseFolder(w fyne.Window, target *widget.Entry) {
-	folderDialog := dialog.NewFolderOpen(func(uri fyne.ListableURI, err error) {
-		if err != nil || uri == nil {
-			return
-		}
-		target.SetText(uri.Path())
-	}, w)
-	// The default folder picker can be cramped on Windows. A larger size makes
-	// long paths readable and avoids forcing the user to resize it every time.
-	folderDialog.Resize(fyne.NewSize(900, 640))
-	folderDialog.Show()
-}
-
-// settingsFolderPath resolves what a directory field currently points at,
-// applying the same relative-path rule the store uses when it loads the config
-// so the folder that opens is the one the setting would use. Blank text has no
-// folder to open and yields an empty path.
-func settingsFolderPath(appDir string, text string) string {
-	trimmed := strings.TrimSpace(text)
-	if trimmed == "" {
-		return ""
-	}
-	return storage.ResolveConfiguredPath(appDir, trimmed)
-}
-
-// openFolder reveals dir in the desktop file manager. A folder that is not set
-// or cannot be opened (most often: it does not exist yet, because the logs
-// directory is created on the first run) is reported in a dialog rather than
-// leaving the button looking dead.
-func openFolder(w fyne.Window, dir string) {
-	if dir == "" {
-		dialog.ShowError(errors.New("no folder is set"), w)
-		return
-	}
-	if err := filemanager.Open(dir); err != nil {
-		dialog.ShowError(err, w)
-	}
+	return newSettingsLayout(settingsFormFields{
+		startOnLogin:        startOnLogin,
+		autostartStatus:     autostartStatus,
+		minimizeToTray:      minimizeToTray,
+		notifications:       notifications,
+		themeSelect:         themeSelect,
+		executionModeSelect: executionModeSelect,
+		overlapPolicySelect: overlapPolicySelect,
+		defaultTimeout:      defaultTimeout,
+		configPath:          store.Paths.ConfigPath,
+		jobsFile:            jobsFile,
+		jobsFileBrowse:      jobsFileBrowse,
+		logsDir:             logsDir,
+		logsDirOpen:         logsDirOpen,
+		logsDirBrowse:       logsDirBrowse,
+		maxLogFiles:         maxLogFiles,
+		maxLogAgeDays:       maxLogAgeDays,
+		saveSettings:        saveSettings,
+		cancelSettings:      cancelSettings,
+		restoreDefaults:     restoreDefaults,
+		settingsStatus:      settingsStatus,
+	})
 }
 
 // Theme dropdown labels. These are the human-facing captions; themeLabel and
@@ -435,10 +275,3 @@ func themeFromLabel(label string) domain.Theme {
 	}
 	return domain.ThemeDefault
 }
-
-func settingsRow(label string, value fyne.CanvasObject) fyne.CanvasObject {
-	caption := widget.NewLabelWithStyle(label, fyne.TextAlignLeading, fyne.TextStyle{Bold: true})
-	caption.Wrapping = fyne.TextTruncate
-	captionBox := container.New(minWidthLayout{width: settingsLabelWidth}, caption)
-	return container.NewBorder(nil, nil, captionBox, nil, value)
-}

src/ui/settings_view_helpers.go

@@ -0,0 +1,107 @@
+package ui
+
+import (
+	"errors"
+	"net/url"
+	"runtime/debug"
+	"strings"
+
+	"gitea.mixdep.ru/mix/gosentry/src/platform/filemanager"
+	"gitea.mixdep.ru/mix/gosentry/src/storage"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/dialog"
+	fynestorage "fyne.io/fyne/v2/storage"
+	"fyne.io/fyne/v2/widget"
+)
+
+func fyneVersion() string {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "unknown"
+	}
+	for _, dependency := range info.Deps {
+		if dependency.Path == "fyne.io/fyne/v2" {
+			if dependency.Replace != nil && dependency.Replace.Version != "" {
+				return dependency.Replace.Version
+			}
+			if dependency.Version != "" {
+				return dependency.Version
+			}
+			return "local"
+		}
+	}
+	return "unknown"
+}
+
+func mustParseURL(raw string) *url.URL {
+	parsed, err := url.Parse(raw)
+	if err != nil {
+		return &url.URL{}
+	}
+	return parsed
+}
+
+// chooseFile opens a file picker that writes the chosen path into target. A
+// nil filter offers every file, as job_dialog.go's command browser wants;
+// chooseJSONFile passed an extension filter here before the two were merged,
+// since they differed only by that one call.
+func chooseFile(w fyne.Window, target *widget.Entry, filter fynestorage.FileFilter) {
+	fileDialog := dialog.NewFileOpen(func(uri fyne.URIReadCloser, err error) {
+		if err != nil || uri == nil {
+			return
+		}
+		target.SetText(uri.URI().Path())
+	}, w)
+	if filter != nil {
+		fileDialog.SetFilter(filter)
+	}
+	fileDialog.Resize(fyne.NewSize(900, 640))
+	fileDialog.Show()
+}
+
+// chooseJSONFile is chooseFile restricted to .json files, used for the jobs
+// file so the picker does not list every file in the folder. The entry stays
+// editable, which is how a path to a file that does not exist yet is entered.
+func chooseJSONFile(w fyne.Window, target *widget.Entry) {
+	chooseFile(w, target, fynestorage.NewExtensionFileFilter([]string{".json"}))
+}
+
+func chooseFolder(w fyne.Window, target *widget.Entry) {
+	folderDialog := dialog.NewFolderOpen(func(uri fyne.ListableURI, err error) {
+		if err != nil || uri == nil {
+			return
+		}
+		target.SetText(uri.Path())
+	}, w)
+	// The default folder picker can be cramped on Windows. A larger size makes
+	// long paths readable and avoids forcing the user to resize it every time.
+	folderDialog.Resize(fyne.NewSize(900, 640))
+	folderDialog.Show()
+}
+
+// settingsFolderPath resolves what a directory field currently points at,
+// applying the same relative-path rule the store uses when it loads the config
+// so the folder that opens is the one the setting would use. Blank text has no
+// folder to open and yields an empty path.
+func settingsFolderPath(appDir string, text string) string {
+	trimmed := strings.TrimSpace(text)
+	if trimmed == "" {
+		return ""
+	}
+	return storage.ResolveConfiguredPath(appDir, trimmed)
+}
+
+// openFolder reveals dir in the desktop file manager. A folder that is not set
+// or cannot be opened (most often: it does not exist yet, because the logs
+// directory is created on the first run) is reported in a dialog rather than
+// leaving the button looking dead.
+func openFolder(w fyne.Window, dir string) {
+	if dir == "" {
+		dialog.ShowError(errors.New("no folder is set"), w)
+		return
+	}
+	if err := filemanager.Open(dir); err != nil {
+		dialog.ShowError(err, w)
+	}
+}

src/ui/settings_view_layout.go

@@ -0,0 +1,138 @@
+package ui
+
+import (
+	"runtime"
+
+	"gitea.mixdep.ru/mix/gosentry/src/app"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+)
+
+// settingsFormFields groups every widget the Settings tab's two-column layout
+// arranges. It exists so newSettingsLayout takes one argument instead of
+// twenty, and so a widget added in settingsView is added to exactly one
+// struct literal rather than threaded through a long parameter list.
+type settingsFormFields struct {
+	startOnLogin        *widget.Check
+	autostartStatus     *widget.Label
+	minimizeToTray      *widget.Check
+	notifications       *widget.Check
+	themeSelect         *widget.Select
+	executionModeSelect *widget.Select
+	overlapPolicySelect *widget.Select
+	defaultTimeout      *widget.Entry
+	configPath          string
+	jobsFile            *widget.Entry
+	jobsFileBrowse      *widget.Button
+	logsDir             *widget.Entry
+	logsDirOpen         *widget.Button
+	logsDirBrowse       *widget.Button
+	maxLogFiles         *widget.Entry
+	maxLogAgeDays       *widget.Entry
+	saveSettings        *widget.Button
+	cancelSettings      *widget.Button
+	restoreDefaults     *widget.Button
+	settingsStatus      *widget.Label
+}
+
+// newSettingsLayout assembles the Settings tab from its fields: a two-column
+// grid (Application/Queue on the left, Storage/About on the right) with the
+// Save/Cancel/Defaults row below.
+func newSettingsLayout(f settingsFormFields) fyne.CanvasObject {
+	// capW is measured once from every caption in the tab so all rows —
+	// Application, Queue, Storage, About — share one value column start,
+	// instead of each settingsRow call re-measuring its own single caption.
+	capW := captionColumnWidth(settingsCaptions...)
+
+	// The form is split into two columns so a wide window uses its horizontal
+	// space instead of stretching into one tall strip. The left column holds the
+	// toggles (Application, Queue); the right holds the editable Storage fields and
+	// the read-only About block. Save spans the full width below both columns.
+	leftColumn := container.NewVBox(
+		settingsSection("Application", rowOverlap(),
+			settingsRow(capW, "Autostart", f.startOnLogin),
+			// Autostart status sits on its own row, aligned under the checkbox via an
+			// empty caption, so the Application section fits in a half-width column.
+			settingsRow(capW, "", f.autostartStatus),
+			settingsRow(capW, "Tray", f.minimizeToTray),
+			settingsRow(capW, "Notifications", f.notifications),
+			settingsRow(capW, "Theme", f.themeSelect),
+		),
+		widget.NewSeparator(),
+		// Queue used to inline its own container.NewVBox at the theme's default
+		// spacing; settingsSection now takes that spacing explicitly so both
+		// idioms for "a titled block of rows" collapse into one constructor.
+		settingsSection("Queue", theme.Padding(),
+			settingsRow(capW, "Execution mode", f.executionModeSelect),
+			settingsRow(capW, "Default overlap policy", f.overlapPolicySelect),
+			settingsRow(capW, "Default timeout (s)", f.defaultTimeout),
+		),
+	)
+	// Truncating keeps a long config path from forcing the Settings tab's
+	// minimum width to track the path length instead of the layout itself.
+	configPathLabel := widget.NewLabel(f.configPath)
+	configPathLabel.Truncation = fyne.TextTruncateClip
+	rightColumn := container.NewVBox(
+		settingsSection("Storage", theme.Padding(),
+			settingsRow(capW, "Config JSON", configPathLabel),
+			settingsRow(capW, "Jobs file", container.NewBorder(nil, nil, nil, f.jobsFileBrowse, f.jobsFile)),
+			// Browse stays rightmost so it lines up with the Jobs file row
+			// above it; Open sits between it and the path it opens.
+			settingsRow(capW, "Logs directory", container.NewBorder(nil, nil, nil, container.NewHBox(f.logsDirOpen, f.logsDirBrowse), f.logsDir)),
+			settingsRow(capW, "Max log files", f.maxLogFiles),
+			settingsRow(capW, "Max log age days", f.maxLogAgeDays),
+		),
+		widget.NewSeparator(),
+		settingsSection("About", rowOverlap(),
+			settingsRow(capW, "GoSentry", widget.NewLabel(app.Version)),
+			settingsRow(capW, "Go", widget.NewLabel(runtime.Version())),
+			settingsRow(capW, "Fyne", widget.NewLabel(fyneVersion())),
+			settingsRow(capW, "Repository", widget.NewHyperlink(projectRepositoryURL, mustParseURL(projectRepositoryURL))),
+		),
+	)
+
+	// The two columns sit in a top-aligned grid; Save spans the full width below.
+	// Wrapping the whole thing in a vertical scroll keeps its minimum height small
+	// so it does not dictate the window's minimum height (AppTabs sizes to the
+	// tallest tab) and it scrolls on short 720p screens.
+	// The button row sits right below the separator's hairline, which reads as
+	// tighter than the other vertical gaps in the tab (those separate whole
+	// sections, not a single thin line from a row of buttons). A top pad the
+	// height of the default padding closes that gap up to match, and a left pad
+	// indents the buttons 4px from the edge the layout promises.
+	return container.NewVScroll(container.NewPadded(container.NewVBox(
+		container.NewGridWithColumns(2, leftColumn, rightColumn),
+		widget.NewSeparator(),
+		container.New(
+			layout.NewCustomPaddedLayout(2*theme.Padding(), 0, theme.Padding(), 0),
+			// Save/Cancel/Defaults share one row with the status so an empty status
+			// (the common case) does not leave a blank line above the separator. The
+			// status appears beside the buttons once a save reports a result.
+			container.NewHBox(f.saveSettings, f.cancelSettings, f.restoreDefaults, f.settingsStatus),
+		),
+	)))
+}
+
+// settingsSection groups a bold header above its rows, using the given
+// vertical spacing between them. Application and About pass rowOverlap() so
+// the block reads as one compact unit; Queue and Storage pass theme.Padding()
+// (the same spacing container.NewVBox would use) so their entry-heavy rows
+// keep a visible gap. One constructor for "a titled block of rows" rather
+// than two spellings of it.
+func settingsSection(title string, spacing float32, rows ...fyne.CanvasObject) fyne.CanvasObject {
+	children := make([]fyne.CanvasObject, 0, len(rows)+1)
+	children = append(children, widget.NewLabelWithStyle(title, fyne.TextAlignLeading, fyne.TextStyle{Bold: true}))
+	children = append(children, rows...)
+	return container.New(layout.NewCustomPaddedVBoxLayout(spacing), children...)
+}
+
+func settingsRow(captionWidth float32, label string, value fyne.CanvasObject) fyne.CanvasObject {
+	caption := widget.NewLabelWithStyle(label, fyne.TextAlignLeading, fyne.TextStyle{Bold: true})
+	caption.Truncation = fyne.TextTruncateClip
+	captionBox := container.New(minWidthLayout{width: captionWidth}, caption)
+	return container.NewBorder(nil, nil, captionBox, nil, value)
+}

src/ui/settings_view_test.go

@@ -5,6 +5,8 @@ import (
 	"testing"
 
 	"fyne.io/fyne/v2"
+	fynestorage "fyne.io/fyne/v2/storage"
+	"fyne.io/fyne/v2/test"
 	"fyne.io/fyne/v2/widget"
 )
 
@@ -43,7 +45,7 @@ func TestSettingsFolderPath(t *testing.T) {
 // wrapping it in a fixed-width layout was redundant.
 func TestSettingsRowStretchesItsControl(t *testing.T) {
 	entry := widget.NewEntry()
-	row := settingsRow("Label", entry)
+	row := settingsRow(captionColumnWidth("Label"), "Label", entry)
 
 	baseWidth := entry.Size().Width
 	wide := fyne.NewSize(row.MinSize().Width+200, row.MinSize().Height)
@@ -57,3 +59,57 @@ func TestSettingsRowStretchesItsControl(t *testing.T) {
 		t.Errorf("control did not stretch to fill the row: entry width = %v, want at least %v", got, baseWidth+150)
 	}
 }
+
+// TestChooseFileAppliesFilter is the coverage for the deduplicated file picker
+// (chooseFile absorbed chooseJSONFile's SetFilter call behind a nil-means-none
+// filter argument): both a nil filter (job_dialog.go's command browser) and a
+// concrete one (chooseJSONFile) must open a dialog without panicking, and the
+// dialog must actually appear as a canvas overlay either way.
+func TestChooseFileAppliesFilter(t *testing.T) {
+	testApp := test.NewApp()
+	defer testApp.Quit()
+	w := testApp.NewWindow("test")
+	defer w.Close()
+
+	target := widget.NewEntry()
+
+	chooseFile(w, target, nil)
+	if w.Canvas().Overlays().Top() == nil {
+		t.Fatal("chooseFile(nil filter) did not open a dialog")
+	}
+	w.Canvas().Overlays().Top().Hide()
+
+	chooseJSONFile(w, target)
+	if w.Canvas().Overlays().Top() == nil {
+		t.Fatal("chooseJSONFile did not open a dialog")
+	}
+	w.Canvas().Overlays().Top().Hide()
+
+	// Exercising a concrete filter directly through chooseFile as well, so the
+	// filter parameter itself (not just chooseJSONFile's use of it) is covered.
+	chooseFile(w, target, fynestorage.NewExtensionFileFilter([]string{".json"}))
+	if w.Canvas().Overlays().Top() == nil {
+		t.Fatal("chooseFile(non-nil filter) did not open a dialog")
+	}
+	w.Canvas().Overlays().Top().Hide()
+}
+
+// TestSettingsCaptionsCoverEveryRow is the settings-tab analog of F10's
+// jobs-details guard: every caption settingsView actually uses in a row must
+// be present in settingsCaptions and measure no wider than
+// captionColumnWidth's result for that list, or a caption added to a row
+// without adding it to settingsCaptions would silently misalign that column.
+func TestSettingsCaptionsCoverEveryRow(t *testing.T) {
+	testApp := test.NewApp()
+	defer testApp.Quit()
+
+	capW := captionColumnWidth(settingsCaptions...)
+	for _, c := range settingsCaptions {
+		if c == "" {
+			continue
+		}
+		if w := widget.NewLabelWithStyle(c, fyne.TextAlignLeading, fyne.TextStyle{Bold: true}).MinSize().Width; w > capW {
+			t.Errorf("caption %q measures %v, wider than captionColumnWidth's %v", c, w, capW)
+		}
+	}
+}