GLSupport: GLX - recover from more XRandR failure cases

Author: paroj

RenderSystems/GLSupport/src/EGL/X11/OgreX11EGLSupport.cpp

@@ -105,7 +105,9 @@ namespace Ogre {
                 }
                 XRRFreeScreenConfigInfo(screenConfig);
             }
-        } else
+        }
+
+        if(mVideoModes.empty()) // none of the above worked
         {
             mCurrentMode.width = DisplayWidth(mNativeDisplay, DefaultScreen(mNativeDisplay));
             mCurrentMode.height = DisplayHeight(mNativeDisplay, DefaultScreen(mNativeDisplay));

RenderSystems/GLSupport/src/GLX/OgreGLXGLSupport.cpp

@@ -117,7 +117,8 @@ namespace Ogre
                 XRRFreeScreenConfigInfo(screenConfig);
             }
         }
-        else
+
+        if(mVideoModes.empty())
         {
             mCurrentMode.width = DisplayWidth(mXDisplay, DefaultScreen(mXDisplay));
             mCurrentMode.height = DisplayHeight(mXDisplay, DefaultScreen(mXDisplay));