Method DockNodeIsDropAllowed

imgui_tiny_app/imgui/imgui.cpp:19746–19759

}

static bool ImGui::DockNodeIsDropAllowed(ImGuiWindow* host_window, ImGuiWindow* root_payload)
{
    if (root_payload->DockNodeAsHost && root_payload->DockNodeAsHost->IsSplitNode()) // FIXME-DOCK: Missing filtering
        return true;

    const int payload_count = root_payload->DockNodeAsHost ? root_payload->DockNodeAsHost->Windows.Size : 1;
    for (int payload_n = 0; payload_n < payload_count; payload_n++)
    {
        ImGuiWindow* payload = root_payload->DockNodeAsHost ? root_payload->DockNodeAsHost->Windows[payload_n] : root_payload;
        if (DockNodeIsDropAllowedOne(payload, host_window))
            return true;
    }
    return false;
}

// window menu button == collapse button when not in a dock node.
// FIXME: This is similar to RenderWindowTitleBarContents(), may want to share code.