How to prevent two different ImGuiWindowClass from docking within each-other

[vassilcom]

Version: 1.88 (commit : aceab9a8 / 5 Aug 2022)
Branch: docking

Linux Mint 20.2

I'm not sure if it's the right place for this issue - whether this is a bug or I'm missing something, but..

I'm trying to create two groups (window class) of dockable windows (left and right on the attached gif). Each window should dock only within its own group, and should not interact with the windows from the opposite group.

It works as expected till some point: as soon as windows are coupled, it/they become dockable with both, its own and opposite group (hope the gif will explain it better).

Is there any way to fix this issue, that is, to isolate those two groups from interacting between each-other?

    {
    
        ImGuiWindowClass window_class1;
        window_class1.ClassId = ImGui::GetID("set1");
        window_class1.DockingAllowUnclassed = false;

        ImGui::SetNextWindowClass(&window_class1);
        ImGui::Begin("Window1_a");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());
        }
        ImGui::End();

        ImGui::SetNextWindowClass(&window_class1);
        ImGui::Begin("Window1_b");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());
        }
        ImGui::End();

        ImGui::SetNextWindowClass(&window_class1);
        ImGui::Begin("Window1_c");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());
        }
        ImGui::End();

        ImGui::SetNextWindowClass(&window_class1);
        ImGui::Begin("Window1_d");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());
        }
        ImGui::End();
    }

    {
        ImGuiWindowClass window_class2;
        window_class2.ClassId = ImGui::GetID("set2");
        window_class2.DockingAllowUnclassed = false;


        ImGui::SetNextWindowClass(&window_class2);
        ImGui::Begin("Window2_a");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());            
        }
        ImGui::End();

        ImGui::SetNextWindowClass(&window_class2);
        ImGui::Begin("Window2_b");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());
        }
        ImGui::End();

        ImGui::SetNextWindowClass(&window_class2);
        ImGui::Begin("Window2_c");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());
        }
        ImGui::End();

        ImGui::SetNextWindowClass(&window_class2);
        ImGui::Begin("Window2_d");
        {
            ImGui::Text("dock id %d", (int)ImGui::GetWindowDockID());
        }
        ImGui::End();
    }