Index: sources/gui/qml/components/HeaderBarPopup.qml
===================================================================
diff -u -r16a8f25568b4636ebc31e76c86a8031940cc4ad7 -r99e596082b87afd73b06dae039d51e4a67cc5913
--- sources/gui/qml/components/HeaderBarPopup.qml	(.../HeaderBarPopup.qml)	(revision 16a8f25568b4636ebc31e76c86a8031940cc4ad7)
+++ sources/gui/qml/components/HeaderBarPopup.qml	(.../HeaderBarPopup.qml)	(revision 99e596082b87afd73b06dae039d51e4a67cc5913)
@@ -18,6 +18,11 @@
      * \param   vButton     - Headerbar icon button
      */
     function openDialog     ( vButton ) {
+        if ( visible ) {
+            close()
+            return
+        }
+
         button = vButton
         adjustPosition(button)
         open()
@@ -32,7 +37,7 @@
     closePolicy         : Dialog.CloseOnPressOutside
     y                   : Variables.headerHeight + 5
     backgroundColor     : Colors.offWhite
-    showDropShadow      : true
+    // showDropShadow      : true
 
     onImplicitWidthChanged: Qt.callLater(function() { if (button) { adjustPosition(_root.button) } })
 }