Activate selection and result dialogs when showing.

ResultDialog.cpp

@@ -57,4 +57,5 @@ void ResultDialog::showResult (ProcessingItem item) {
     QPoint newPos (screenRect.width () - width (), screenRect.height () - height ());
     move (newPos);
   }
+  activateWindow ();
 }

SelectionDialog.cpp

@@ -136,5 +136,5 @@ void SelectionDialog::setPixmap (QPixmap pixmap, const QRect &showGeometry) {
   this->setGeometry (showGeometry);
 
   show ();
-  setFocus ();
+  activateWindow ();
 }