Function DockNodeSetupHostWindow

imgui_tiny_app/imgui/imgui.cpp:18993–19005

}

static void DockNodeSetupHostWindow(ImGuiDockNode* node, ImGuiWindow* host_window)
{
    // Remove ourselves from any previous different host window
    // This can happen if a user mistakenly does (see #4295 for details):
    //  - N+0: DockBuilderAddNode(id, 0)    // missing ImGuiDockNodeFlags_DockSpace
    //  - N+1: NewFrame()                   // will create floating host window for that node
    //  - N+1: DockSpace(id)                // requalify node as dockspace, moving host window
    if (node->HostWindow && node->HostWindow != host_window && node->HostWindow->DockNodeAsHost == node)
        node->HostWindow->DockNodeAsHost = NULL;

    host_window->DockNodeAsHost = node;
    node->HostWindow = host_window;
}

static void ImGui::DockNodeUpdate(ImGuiDockNode* node)
{