Examples: Fix for Emscripten. GLFW+WGPU: rework examples main loop to handle minimization. (#7844)

Amend 8874787, 71ee2ce
Amend ea39841f (emscripten_mainloop_stub.h)

examples/example_sdl3_sdlrenderer3/main.cpp

@@ -167,6 +167,9 @@ int main(int, char**)
         ImGui_ImplSDLRenderer3_RenderDrawData(ImGui::GetDrawData(), renderer);
         SDL_RenderPresent(renderer);
     }
+#ifdef __EMSCRIPTEN__
+    EMSCRIPTEN_MAINLOOP_END;
+#endif
 
     // Cleanup
     ImGui_ImplSDLRenderer3_Shutdown();