Preserve terminal feedback while coalescing repaints

internal/app/event_caret_test.go

@@ -187,6 +187,13 @@ func TestTerminalCaretSeedsReviewFocusWithoutFocusEvent(t *testing.T) {
 	if got := worker.Focus(); got != terminal.ID() {
 		t.Fatalf("review focus after unfocused caret = %+v, want %+v", got, terminal.ID())
 	}
+	// Another widget in the same application can retain a stale focused
+	// bit. Its caret must not move review away from the known focus.
+	other.Focused = true
+	handler.handleCaret(atspi.NewEvent(atspi.CaretEvent, other), input.Activity{}, input.TypingIntent)
+	if got := worker.Focus(); got != state.focusedID {
+		t.Fatalf("stale focused bit split review and input ownership: %+v != %+v", got, state.focusedID)
+	}
 }
 
 func TestProcessEventsSpeaksCaretCharacters(t *testing.T) {