Weird keyboard nav with multiple BeginMenu calls

[u3shit]

Version/Branch of Dear ImGui:

Version: 1.77
Branch: master

Back-end/Renderer/Compiler/OS

Back-ends: imgui_impl_glew.cpp + imgui_impl_opengl3.cpp
Operating System: Linux

My Issue/Question:

In my program, I can call BeginMainMenuBar and BeginMenu multiple times, and the menu items I add are automatically combined. Neat! But the keyboard navigation is working weird in this case. In the example below I add 4 menu items in two different locations. If I open the menu and start pressing the down button, the selection goes to a, b then it wraps back to a. If I press up, I get to d and actually only pressing the up button I can go through the whole menu, but not in the other direction. Also if I press down while d is selected, nothing happens.
The comment in imgui.h says "Use BeginMenu() to create a menu. You can call BeginMenu() multiple time with the same identifier to append more items to it." so I suppose this is a supported operation, and it works fine with mouse.

Screenshots/Video

Standalone, minimal, complete and verifiable example:

if (ImGui::BeginMainMenuBar())
{
  if (ImGui::BeginMenu("Menu"))
  {
    ImGui::MenuItem("a");
    ImGui::MenuItem("b");
    ImGui::EndMenu();
  }
  ImGui::EndMainMenuBar();
}

if (ImGui::BeginMainMenuBar())
{
  if (ImGui::BeginMenu("Menu"))
  {
    ImGui::MenuItem("c");
    ImGui::MenuItem("d");
    ImGui::EndMenu();
  }
  ImGui::EndMainMenuBar();
}

[ocornut]

Thanks for reporting.
Should now fixed by a6f4b0f courtesy of @rokups (also added a regression test for it)