Arrow-key navigation in the add dialog

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

internal/ui/form_test.go

@@ -0,0 +1,50 @@
+package ui
+
+import (
+	"testing"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+func TestArrowNavigation(t *testing.T) {
+	f := tview.NewForm().
+		AddDropDown("A", []string{"x", "y", "z"}, 0, nil).
+		AddCheckbox("B", true, nil).
+		AddButton("Add", nil).AddButton("Cancel", nil)
+	arrowNavigation(f)
+	var focus func(p tview.Primitive)
+	focus = func(p tview.Primitive) { p.Focus(focus) }
+	f.Focus(focus)
+	cap := f.GetInputCapture()
+	send := func(key tcell.Key) { cap(tcell.NewEventKey(key, 0, 0)) }
+
+	dd := f.GetFormItem(0).(*tview.DropDown)
+	send(tcell.KeyRight)
+	if i, _ := dd.GetCurrentOption(); i != 1 {
+		t.Fatalf("Right: option %d, want 1", i)
+	}
+	send(tcell.KeyLeft)
+	send(tcell.KeyLeft)
+	if i, _ := dd.GetCurrentOption(); i != 2 {
+		t.Fatalf("Left wraps: option %d, want 2", i)
+	}
+	send(tcell.KeyDown)
+	if item, _ := f.GetFocusedItemIndex(); item != 1 {
+		t.Fatalf("Down: item %d, want 1", item)
+	}
+	send(tcell.KeyDown)
+	send(tcell.KeyDown)
+	send(tcell.KeyDown) // clamps at the last button
+	if _, b := f.GetFocusedItemIndex(); b != 1 {
+		t.Fatalf("button %d, want 1", b)
+	}
+	send(tcell.KeyLeft)
+	if _, b := f.GetFocusedItemIndex(); b != 0 {
+		t.Fatalf("Left on buttons: %d, want 0", b)
+	}
+	send(tcell.KeyUp)
+	if item, _ := f.GetFocusedItemIndex(); item != 1 {
+		t.Fatalf("Up from first button: item %d, want 1", item)
+	}
+}