Screen grabber: Wait for the flyout to collapse before grabbing

After clicking the "Screenshot" button in the file flyout, the flyout
now collapses and then triggers the screenshot functionality. This adds
a delay of ca. 1/3 seconds between the click and the action.

src/widget/form/chatform.cpp

@@ -48,6 +48,7 @@
 #include "src/chatlog/chatlog.h"
 #include "src/offlinemsgengine.h"
 #include "src/widget/tool/screenshotgrabber.h"
+#include "src/widget/tool/flyoutoverlaywidget.h"
 
 ChatForm::ChatForm(Friend* chatFriend)
     : f(chatFriend)
@@ -865,11 +866,18 @@ void ChatForm::loadHistory(QDateTime since, bool processUndelivered)
 
 void ChatForm::onScreenshotClicked()
 {
+    connect(fileFlyout, &FlyoutOverlayWidget::hidden, this, &ChatForm::doScreenshot);
+    hideFileMenu();
+}
+
+void ChatForm::doScreenshot()
+{
+    disconnect(fileFlyout, &FlyoutOverlayWidget::hidden, this, &ChatForm::doScreenshot);
+    
     ScreenshotGrabber* screenshotGrabber = new ScreenshotGrabber (this);
     connect(screenshotGrabber, &ScreenshotGrabber::screenshotTaken, this, &ChatForm::onScreenshotTaken);
+    screenshotGrabber->showGrabber();
     
-    // Try to not grab the context-menu
-    QTimer::singleShot(200, screenshotGrabber, &ScreenshotGrabber::showGrabber);
 }
 
 void ChatForm::onScreenshotTaken (const QPixmap &pixmap) {

src/widget/form/chatform.h

@@ -97,6 +97,7 @@ private slots:
     void onEnableCallButtons();
     void onScreenshotClicked();
     void onScreenshotTaken(const QPixmap &pixmap);
+    void doScreenshot();
 
 protected:
     // drag & drop

src/widget/tool/flyoutoverlaywidget.cpp

@@ -20,6 +20,7 @@
 #include <QHBoxLayout>
 #include <QPainter>
 #include <QBitmap>
+#include <QTimer>
 
 FlyoutOverlayWidget::FlyoutOverlayWidget(QWidget *parent)
     : QWidget(parent)
@@ -97,4 +98,9 @@ void FlyoutOverlayWidget::finishedAnimation()
 {
     bool hide = (animation->direction() == QAbstractAnimation::Backward);
     setAttribute(Qt::WA_TransparentForMouseEvents, hide);
+    
+    // Delay it by a few frames to let the system catch up on rendering
+    if (hide)
+        QTimer::singleShot(50, this, &FlyoutOverlayWidget::hidden);
+    
 }

src/widget/tool/flyoutoverlaywidget.h

@@ -40,6 +40,10 @@ public:
     void animateShow();
     void animateHide();
     
+signals:
+    
+    void hidden();
+    
 protected:
     void leaveEvent(QEvent* event);