Gui: Add animation interrupted signal

src/Gui/NavigationAnimation.h

@@ -34,9 +34,14 @@ namespace Gui
 
 class GuiExport NavigationAnimation : protected QVariantAnimation
 {
+    Q_OBJECT
 public:
+    using QVariantAnimation::QObject;
     explicit NavigationAnimation(NavigationStyle* navigation);
 
+Q_SIGNALS:
+    void interrupted();
+
 protected:
     NavigationStyle* navigation;
 

src/Gui/NavigationAnimator.cpp

@@ -68,6 +68,10 @@ bool NavigationAnimator::startAndWait(const std::shared_ptr<NavigationAnimation>
     bool finished = true;
     QEventLoop loop;
     connect(animation.get(), &NavigationAnimation::finished, &loop, &QEventLoop::quit);
+    connect(animation.get(), &NavigationAnimation::interrupted, &loop, [&finished, &loop]() {
+        finished = false;
+        loop.quit();
+    });
     start(animation);
     loop.exec();
     return finished;
@@ -80,6 +84,7 @@ void NavigationAnimator::stop()
 {
     if (activeAnimation && activeAnimation->state() != QAbstractAnimation::State::Stopped) {
         disconnect(activeAnimation.get(), &NavigationAnimation::finished, 0, 0);
+        Q_EMIT activeAnimation->interrupted();
         activeAnimation->stop();
         activeAnimation->onStop(false);
         activeAnimation.reset();