Give a parent view's keybindings the same precedence as a view's own

When a key matches several bindings of the same view, the first one wins;
when it matches several of the view's parent, the last one did.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

pkg/gocui/gui.go

@@ -1979,7 +1979,7 @@ func (g *Gui) execKeybindings(v *View, ev *GocuiEvent) error {
 			matchingParentViewKb = nil
 			break
 		}
-		if v != nil && g.matchView(v.ParentView, kb) {
+		if matchingParentViewKb == nil && v != nil && g.matchView(v.ParentView, kb) {
 			matchingParentViewKb = kb
 		}
 		if globalKb == nil && kb.viewName == "" {

pkg/gocui/parent_view_test.go

@@ -0,0 +1,76 @@
+package gocui
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// A view and its parent view, with the child holding the focus.
+func setupParentAndChildView(t *testing.T, g *Gui) (*View, *View) {
+	t.Helper()
+
+	parent, _ := g.SetView("parent", 0, 0, 20, 10, 0)
+	child, _ := g.SetView("child", 0, 10, 20, 12, 0)
+	child.ParentView = parent
+	_, err := g.SetCurrentView(child.Name())
+	assert.NoError(t, err)
+
+	return parent, child
+}
+
+func TestKeybindingOfParentViewIsUsedWhenChildHasNone(t *testing.T) {
+	g := newTestGui(t)
+	parent, child := setupParentAndChildView(t, g)
+
+	pressed := []string{}
+	g.SetKeybinding(parent.Name(), NewKeyName(KeyArrowDown), func(*Gui, *View) error {
+		pressed = append(pressed, "parent")
+		return nil
+	})
+	g.SetKeybinding(child.Name(), NewKeyName(KeyEnter), func(*Gui, *View) error {
+		pressed = append(pressed, "child")
+		return nil
+	})
+
+	assert.NoError(t, g.onKey(&GocuiEvent{Type: eventKey, Key: NewKeyName(KeyArrowDown)}))
+	assert.NoError(t, g.onKey(&GocuiEvent{Type: eventKey, Key: NewKeyName(KeyEnter)}))
+
+	assert.Equal(t, []string{"parent", "child"}, pressed)
+}
+
+func TestFirstMatchingKeybindingOfParentViewWins(t *testing.T) {
+	g := newTestGui(t)
+	parent, _ := setupParentAndChildView(t, g)
+
+	pressed := []string{}
+	for _, name := range []string{"first", "second"} {
+		g.SetKeybinding(parent.Name(), NewKeyName(KeyArrowDown), func(*Gui, *View) error {
+			pressed = append(pressed, name)
+			return nil
+		})
+	}
+
+	assert.NoError(t, g.onKey(&GocuiEvent{Type: eventKey, Key: NewKeyName(KeyArrowDown)}))
+
+	assert.Equal(t, []string{"first"}, pressed)
+}
+
+func TestUnhandledKeybindingOfParentViewFallsThroughToEditor(t *testing.T) {
+	g := newTestGui(t)
+	parent, child := setupParentAndChildView(t, g)
+
+	edited := []Key{}
+	child.Editable = true
+	child.Editor = EditorFunc(func(_ *View, key Key) bool {
+		edited = append(edited, key)
+		return true
+	})
+	g.SetKeybinding(parent.Name(), NewKeyName(KeyArrowDown), func(*Gui, *View) error {
+		return ErrKeybindingNotHandled
+	})
+
+	assert.NoError(t, g.onKey(&GocuiEvent{Type: eventKey, Key: NewKeyName(KeyArrowDown)}))
+
+	assert.Equal(t, []Key{NewKeyName(KeyArrowDown)}, edited)
+}