Don't switch between GLX and EGL if EGL worked

app/streaming/video/ffmpeg-renderers/eglvid.cpp

@@ -732,6 +732,15 @@ bool EGLRenderer::initialize(PDECODER_PARAMETERS params)
     // Detach the context from this thread, so the render thread can attach it
     SDL_GL_MakeCurrent(m_Window, nullptr);
 
+#ifdef SDL_HINT_VIDEO_X11_FORCE_EGL
+    if (err == GL_NO_ERROR) {
+        // If we got a working GL implementation via EGL, avoid using GLX from now on.
+        // GLX will cause problems if we later want to use EGL again on this window.
+        SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "EGL passed preflight checks. Using EGL for GL context creation.");
+        SDL_SetHint(SDL_HINT_VIDEO_X11_FORCE_EGL, "1");
+    }
+#endif
+
     return err == GL_NO_ERROR;
 }