Docking operation resets the background color of attached sub windows

[EssenOH]

Version/Branch of Dear ImGui:

Version: v1.83 WIP
Branch: v1.83 WIP_(docking)_

Back-end/Renderer/Compiler/OS

Back-ends: imgui_impl_win32.cpp + imgui_impl_dx12.cpp
Compiler: Visual Studio 2017
Operating System: Windows 10

My Issue/Question:

Docking operation change the background color of sub window

Screenshots/Video

[ before docking ]

[while docking ]

[after docking ]

// snippet code to create the sub window & set the background color
const ImU32 color =
root_node_id_ != -1 ? evaluate(graph_, root_node_id_) : IM_COL32(255, 20, 147, 255);
ImGui::PushStyleColor(ImGuiCol_WindowBg, color);
ImGui::Begin("output color");
ImGui::End();
ImGui::PopStyleColor();

[ocornut]

Hello,

Closing as duplicate of #2700
See in particular my recent post: #2700 (comment)

I've got an "almost working" version of it but it's not easy to fix the edge cases and they would lead to flickering (no background at all for 1-2 frames) in some cases.

Further comments are best posted in #2700. Thank you!