Why does the ImGuiListClipper save it's own ImGuiContext?

[Explowox]

Version/Branch of Dear ImGui:

Version 1.90, Branch: master

Back-ends:

imgui_impl_glfw.cpp + imgui_impl_opengl3.cpp

Compiler, OS:

Windows 11 + VS2022

Full config/build information:

No response

Details:

My Question:

I'm currently using the ImGuiFileDialog, where one of the possible ways to create a FileDialog is through access of a Singleton that (among other things) holds an instance of an ImGuiListClipper. However, the ImGuiListClipper instance holds it's own ImGuiContext which is (as far as I can tell) only set once to the current context in the Begin() method and never updated again during the lifetime of the clipper. My project unfortunately switches between multiple ImGuiContexts which invalidates the internal clipper context.

This made me wonder why doesn't the ImGuiListClipper refer to the global GImGui context?

Screenshots/Video:

No response

Minimal, Complete and Verifiable Example code:

No response

[ocornut]

It was added to facilitate the transition toward #5856
A clipper may be reused again with another context, no issue with that.

[ocornut]

For now please clear it with clipper->Ctx = NULL.
I envision that we will rework this API at some point anyhow, making imgui owns the instance so it won't be a problem.
Let me know if you have other questions!