Emit signal when hiding due to focus loss to a non-related window.

src/plasmaquick/dialog.cpp

@@ -798,6 +798,7 @@ void Dialog::focusOutEvent(QFocusEvent *ev)
         if (!parentHasFocus && !childHasFocus) {
             qDebug() << "DIALOG:  hiding dialog.";
             setVisible(false);
+            emit windowDeactivated();
         }
     }
 

src/plasmaquick/dialog.h

@@ -169,6 +169,11 @@ Q_SIGNALS:
     void hideOnWindowDeactivateChanged();
     void outputOnlyChanged();
     void flagsChanged();
+    /**
+     * Emitted when the @see hideOnWindowDeactivate property is @c true and this dialog lost focus to a
+     * window that is neither a parent dialog to nor a child dialog of this dialog.
+     */
+    void windowDeactivated();
 
 protected:
     /*