add setting to disable waveform seekbar

ui/dialogs/settingsdialog.go

@@ -559,6 +559,12 @@ func (s *SettingsDialog) createAppearanceTab(window fyne.Window) *container.TabI
 		}
 	}
 
+	useWaveformSeekbar := widget.NewCheck(lang.L("Use waveform seekbar"), func(b bool) {
+		s.config.Playback.UseWaveformSeekbar = b
+		s.setRestartRequired()
+	})
+	useWaveformSeekbar.Checked = s.config.Playback.UseWaveformSeekbar
+
 	return container.NewTabItem(lang.L("Appearance"), container.NewVBox(
 		util.NewHSpace(0), // insert a theme.Padding amount of space at top
 		container.NewBorder(nil, nil, widget.NewLabel(lang.L("Theme")), /*left*/
@@ -570,6 +576,8 @@ func (s *SettingsDialog) createAppearanceTab(window fyne.Window) *container.TabI
 		container.NewBorder(nil, nil, widget.NewLabel(lang.L("Grid card size")), nil, gridCardSize),
 		disableDPI,
 		s.newSectionSeparator(),
+		useWaveformSeekbar,
+		s.newSectionSeparator(),
 		widget.NewRichText(&widget.TextSegment{Text: lang.L("Application font"), Style: util.BoldRichTextStyle}),
 		container.New(layout.NewFormLayout(),
 			widget.NewLabel(lang.L("Normal font")), container.NewBorder(nil, nil, nil, normalFontBrowse, normalFontEntry),