From 340ebfb2724d05750ad074ea4b6e3e8d9df7946a Mon Sep 17 00:00:00 2001
From: binary1248 <binary1248@hotmail.com>
Date: Sun, 21 Aug 2016 14:01:24 +0200
Subject: [PATCH] Fixed possible hang when setting visibility if external
 window sources e.g. Qt don't forward visibility notify events to us.

---
 src/SFML/Window/Unix/WindowImplX11.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/SFML/Window/Unix/WindowImplX11.cpp b/src/SFML/Window/Unix/WindowImplX11.cpp
index 5fe6eb16..9e7fca76 100644
--- a/src/SFML/Window/Unix/WindowImplX11.cpp
+++ b/src/SFML/Window/Unix/WindowImplX11.cpp
@@ -1003,7 +1003,7 @@ void WindowImplX11::setVisible(bool visible)
 
         // Before continuing, make sure the WM has
         // internally marked the window as viewable
-        while (!m_windowMapped)
+        while (!m_windowMapped && !m_isExternal)
             processEvents();
     }
     else
@@ -1023,7 +1023,7 @@ void WindowImplX11::setVisible(bool visible)
 
         // Before continuing, make sure the WM has
         // internally marked the window as unviewable
-        while (m_windowMapped)
+        while (m_windowMapped && !m_isExternal)
             processEvents();
     }
 }