message: Updated for latest imgui code.
diff: @@ -434,7 +434,7 @@ void ImGui_ImplSdlGL3_NewFrame(SDL_Window* window, bool *use_freetype)
  #endif
  else
  {
  - io.MousePos = io.MousePosInvalid;
  + io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
  }
  io.MouseWheel = g_MouseWheel;
  