HasWindow
bool HasWindow(const BWindow* window);
bool HasWindow(const BMessenger& window);
return HasWindow(messenger);
if (_Windows(previousWorkspace).HasWindow(floating)
if (!_Windows(nextWorkspace).HasWindow(floating)) {
} else if (_Windows(previousWorkspace).HasWindow(floating)
else if (!_Windows(index).HasWindow(FocusWindow())
bool HasWindow(Window* window) const;
if (windowStack.HasWindow(window)) {
if (!windowStack.HasWindow(window)) {
bool HasWindow(WindowLayer* window) const;