ImGui docking window flickers when dragged out

Question

I'm having problems when every time my ImGui docking window is dragged out it starts to flicker and malfunctions.

Is there any ways I can get rid of this problem? Thank you!

while (!glfwWindowShouldClose(window))
{
    // Specify the color of the background
    glClearColor(0.07f, 0.13f, 0.17f, 1.0f);
    // Clean the back buffer and assign the new color to it
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    ImGui_ImplOpenGL3_NewFrame();
    ImGui_ImplGlfw_NewFrame();
    ImGui::NewFrame();

    // Create the docking environment
    ImGuiWindowFlags windowFlags = ImGuiWindowFlags_NoDocking | ImGuiWindowFlags_NoTitleBar |
        ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove |
        ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus |
        ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_AlwaysAutoResize;

    ImGuiViewport* viewport = ImGui::GetMainViewport();
    ImGui::SetNextWindowPos(viewport->Pos);
    ImGui::SetNextWindowSize(viewport->Size);
    ImGui::SetNextWindowViewport(viewport->ID);

    ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 1.0f);
    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
    ImGui::Begin("Dockspace", nullptr, windowFlags);
    {
        ImGui::PopStyleVar(3);

        ImGuiID dockSpaceId = ImGui::GetID("Dockspace");

        ImGui::DockSpace(dockSpaceId, ImVec2(0.0f, 0.0f), ImGuiDockNodeFlags_PassthruCentralNode);
        ImGui::End();
    }

    // Tell OpenGL which Shader Program we want to use
    glUseProgram(shaderProgram);
    // Bind the VAO so OpenGL knows to use it
    glBindVertexArray(VAO);

    // Bind the VAO so OpenGL knows to use it
    glBindVertexArray(VAO);
    // Draw the triangle using the GL_TRIANGLES primitive
    glDrawArrays(GL_TRIANGLES, 0, 3);

    ImGui::Begin("Color Triangle");
    {
        ImGui::ColorEdit4("Color: ", color);
    }
    ImGui::End();

    // Tell OpenGL which Shader Program we want to use
    glUseProgram(shaderProgram);
    glUniform4f(glGetUniformLocation(shaderProgram, "color"), color[0], color[1], color[2], color[3]);

    ImGui::EndFrame();
    ImGui::Render();
    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData()); 
    ImGui::UpdatePlatformWindows(); 
    ImGui::RenderPlatformWindowsDefault();

    // Swap the back buffer with the front buffer
    glfwSwapBuffers(window);

    // Take care of all GLFW events
    glfwPollEvents();
}