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Ah they're finally releasing 9.2 then, good :) I locally have a commit ready for some upstream charts changes, including on the vtkAxis. I will finalize that, open a PR...

A quick test on Windows 10 (but with an older pyvista version) gives following result  I can investigate this in more depth (and on latest main branch) later this...

Regarding the tests I have a question: As this PR introduces different behaviour for different VTK versions, should there be separate tests for each version (and how would that look...

> Thanks! Please also cross-check with #2863 for potential overlaps (I haven't looked at either yet). That one looked good (the axis tests part), I'll merge those changes in here...

Ok, I will proceed like that then 👍 Not sure what the failing "Labeler / triage" test is for? The other documentation and docstringcheck tests fail because they are using...

The failing tests are now fixed locally using vtk 9.2.0rc. I suppose we can keep this a draft until vtk 9.2.0 is actually released? I also reverted the removal of...

I can deal with the `vtkPythonContext2D` import in #2868 as that PR already disables this chart backgrounds feature for older VTK versions.

Thanks for your extensive analysis! The ChartMPL's are redrawn whenever the underlying matplotlib figure is redrawn (using `fig.canvas.draw()`), so there is no need to use the `_redraw` method manually. But...

@TimKieu Please continue this discussion here, as #230 is not relevant to it.

I don't really know what's going wrong, so I'll leave it up to you or do you need my help with this?