openGL: deactivating context on shutdown.

modules/juce_opengl/native/juce_OpenGL_ios.h

@@ -99,6 +99,7 @@ public:
     {
         JUCE_CHECK_OPENGL_ERROR
         freeGLBuffers();
+        deactivateCurrentContext();
     }
 
     bool createdOk() const noexcept             { return getRawContext() != nullptr; }

modules/juce_opengl/native/juce_OpenGL_osx.h

@@ -163,7 +163,7 @@ public:
     }
 
     void initialiseOnRenderThread() {}
-    void shutdownOnRenderThread() {}
+    void shutdownOnRenderThread()               { deactivateCurrentContext(); }
 
     bool createdOk() const noexcept             { return getRawContext() != nullptr; }
     void* getRawContext() const noexcept        { return static_cast <void*> (renderContext); }

modules/juce_opengl/native/juce_OpenGL_win32.h

@@ -82,7 +82,7 @@ public:
     }
 
     void initialiseOnRenderThread() {}
-    void shutdownOnRenderThread() {}
+    void shutdownOnRenderThread()           { deactivateCurrentContext(); }
 
     static void deactivateCurrentContext()  { wglMakeCurrent (0, 0); }
     bool makeActive() const noexcept        { return wglMakeCurrent (dc, renderContext) != FALSE; }