From 1fd645fce411cb3384c1f0683faee26141fd7b0d Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Wed, 8 Jun 2016 02:25:45 +0200
Subject: [PATCH] Fixed masking issue (failed when neither on top nor on bottom
 was set)

---
 src/blackgui/guiutility.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/blackgui/guiutility.cpp b/src/blackgui/guiutility.cpp
index d3c9a19d2..a0641c219 100644
--- a/src/blackgui/guiutility.cpp
+++ b/src/blackgui/guiutility.cpp
@@ -292,12 +292,12 @@ namespace BlackGui
         Qt::WindowFlags flags = widget->windowFlags();
         if (Qt::WindowStaysOnTopHint & flags)
         {
-            flags ^= Qt::WindowStaysOnTopHint;
+            flags &= ~Qt::WindowStaysOnTopHint;
             flags |= Qt::WindowStaysOnBottomHint;
         }
         else
         {
-            flags ^= Qt::WindowStaysOnBottomHint;
+            flags &= ~Qt::WindowStaysOnBottomHint;
             flags |= Qt::WindowStaysOnTopHint;
         }
         widget->setWindowFlags(flags);