Issue disabling WindowMenuButton in Docking branch

[1aam2am1]

Flag:
ImGui::GetStyle().WindowMenuButtonPosition = ImGuiDir_None;
Creates visible artifacts as it displays Hide Bar menu but don't move cursor for drawing tabs.

As you can see setting this flag creates visual artifact, as it should not display hide tab menu.

Also docking window and then undocking it creates problem as SetNextWindowSizeConstraints function don't work anymore even if window is not docked anymore.

[ocornut]

Thanks for the report. I have fixed it with c49330f.

Also docking window and then undocking it creates problem as SetNextWindowSizeConstraints function don't work anymore even if window is not docked anymore.

Generally speaking please report that as separate issue. But there is already an issue for this: #2849, I don't have a fix/solution for it yet.