From a95ec7bc8fa4cff3d0cc9df671354bf7ee150f83 Mon Sep 17 00:00:00 2001
From: ed <eddavies95@gmail.com>
Date: Mon, 6 Jul 2020 11:18:55 +0100
Subject: [PATCH] Linux:  Check parent window is still valid before
 unmapping/destroying embedded OpenGL window

---
 .../juce_opengl/native/juce_OpenGL_linux_X11.h | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/modules/juce_opengl/native/juce_OpenGL_linux_X11.h b/modules/juce_opengl/native/juce_OpenGL_linux_X11.h
index cd23678807..c33018466e 100644
--- a/modules/juce_opengl/native/juce_OpenGL_linux_X11.h
+++ b/modules/juce_opengl/native/juce_OpenGL_linux_X11.h
@@ -126,13 +126,17 @@ public:
 
     ~NativeContext()
     {
-        juce_LinuxRemoveRepaintListener (component.getPeer(), &dummy);
-
-        if (embeddedWindow != 0)
+        if (auto* peer = component.getPeer())
         {
-            XWindowSystemUtilities::ScopedXLock xLock;
-            X11Symbols::getInstance()->xUnmapWindow (display, embeddedWindow);
-            X11Symbols::getInstance()->xDestroyWindow (display, embeddedWindow);
+            juce_LinuxRemoveRepaintListener (peer, &dummy);
+
+            if (embeddedWindow != 0)
+            {
+                XWindowSystemUtilities::ScopedXLock xLock;
+                X11Symbols::getInstance()->xUnmapWindow (display, embeddedWindow);
+                X11Symbols::getInstance()->xDestroyWindow (display, embeddedWindow);
+                X11Symbols::getInstance()->xSync (display, True);
+            }
         }
 
         if (bestVisual != nullptr)
@@ -233,7 +237,7 @@ private:
     GLXContext renderContext = {};
     Window embeddedWindow = {};
 
-    int swapFrames = 0;
+    int swapFrames = 1;
     Rectangle<int> bounds;
     XVisualInfo* bestVisual = nullptr;
     void* contextToShareWith;