Preview filter while browsing an open dropdown; Esc closes only the list

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/ui/libfilter.go

@@ -131,14 +131,20 @@ func (a *App) openAttrFilter(cur attrFilter, languages []string, set func(attrFi
 		AddDropDown(lAudio, withAny(audioOptions), indexOf(audioOptions, cur.audio), nil).
 		AddDropDown(lLang, withAny(languages), indexOf(languages, cur.lang), nil)
 
-	pick := func(label string, options []string) string {
-		i := selected(form, label)
-		if i <= 0 {
-			return ""
+	// filterWith reads the dialog; the entry at index in dropdown over (if
+	// any) stands in for that dropdown's committed choice.
+	filterWith := func(over *tview.DropDown, index int) attrFilter {
+		pick := func(label string, options []string) string {
+			dd := form.GetFormItemByLabel(label).(*tview.DropDown)
+			i, _ := dd.GetCurrentOption()
+			if dd == over {
+				i = index
+			}
+			if i <= 0 {
+				return ""
+			}
+			return options[i-1]
 		}
-		return options[i-1]
-	}
-	current := func() attrFilter {
 		return attrFilter{
 			res:   pick(lRes, resOptions),
 			codec: pick(lCodec, codecOptions),
@@ -147,6 +153,7 @@ func (a *App) openAttrFilter(cur attrFilter, languages []string, set func(attrFi
 			lang:  pick(lLang, languages),
 		}
 	}
+	current := func() attrFilter { return filterWith(nil, 0) }
 	for _, label := range []string{lRes, lCodec, lHDR, lAudio, lLang} {
 		form.GetFormItemByLabel(label).(*tview.DropDown).SetSelectedFunc(func(string, int) { set(current()) })
 	}
@@ -161,8 +168,10 @@ func (a *App) openAttrFilter(cur attrFilter, languages []string, set func(attrFi
 		set(attrFilter{})
 	})
 	form.AddButton("Cancel", cancel)
-	form.SetCancelFunc(cancel)
-	arrowNavigation(form)
+	arrowNavigation(form, cancel, &browseHooks{
+		browse: func(dd *tview.DropDown, index int) { set(filterWith(dd, index)) },
+		abort:  func() { set(current()) }, // list closed without choosing: back to the committed value
+	})
 	form.SetBorder(true).SetTitle(" Filter by properties ")
 	a.openSidePanel(form, 40, 17, "↑↓ move · ←→ change (applies live) · Enter apply · Esc cancel")
 }