message: Popups window can be moved (if they don't have explicit positions provided by user, or e.g. sub-menu popup)
diff: @@ -3591,7 +3591,7 @@ static bool BeginPopupEx(const char* str_id, ImGuiWindowFlags extra_flags)
  }
  ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
  - ImGuiWindowFlags flags = extra_flags|ImGuiWindowFlags_Popup|ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_NoResize|ImGuiWindowFlags_NoSavedSettings|ImGuiWindowFlags_AlwaysAutoResize;
  + ImGuiWindowFlags flags = extra_flags|ImGuiWindowFlags_Popup|ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_NoResize|ImGuiWindowFlags_NoSavedSettings|ImGuiWindowFlags_AlwaysAutoResize;
  char name[20];
  if (flags & ImGuiWindowFlags_ChildMenu)
  