migrate to fyne 2.3

ui/browsing/browsingpane.go

@@ -69,7 +69,7 @@ func NewBrowsingPane(app *backend.App) *BrowsingPane {
 	b.app.PlaybackManager.OnSongChange(b.onSongChange)
 	b.pageContainer = container.NewMax(
 		// TODO: get this color into the theme
-		canvas.NewRectangle(color.RGBA{R: 24, G: 24, B: 24, A: 255}),
+		canvas.NewRectangle(color.RGBA{R: 24, G: 24, B: 40, A: 255}),
 		layout.NewSpacer())
 	b.settingsBtn = widget.NewButtonWithIcon("", theme.SettingsIcon(), func() {
 		p := widget.NewPopUpMenu(b.settingsMenu,

ui/widgets/listheader.go

@@ -42,7 +42,7 @@ func NewListHeader(cols []ListColumn, layout *layouts.ColumnsLayout) *ListHeader
 	for i, _ := range l.columnVisible {
 		l.columnVisible[i] = true
 	}
-	l.container = container.NewMax(canvas.NewRectangle(theme.BackgroundColor()), l.columnsContainer)
+	l.container = container.NewMax(canvas.NewRectangle(theme.ButtonColor()), l.columnsContainer)
 	l.ExtendBaseWidget(l)
 	l.buildColumns()
 	return l