AUI panes can no longer have arbitrary size (3.3.2 regression) (Issue #26302)

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rudolfwalter

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Mar 16, 2026, 11:15:09 AM (2 days ago) Mar 16
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rudolfwalter created an issue (wxWidgets/wxWidgets#26302)

Description

In 3.3.2, AUI panes can no longer be resized arbitrarily. In some cases, they can't be resized at all. Sometimes, resizing up or down makes the separator snap to one of two fixed positions, in the opposite direction of the resize. When docking a floating pane next to another one, one of the two can disappear altogether. The behaviour depends on the order of the panes.

I ran a git bisect, and it looks like it was caused by this commit: 7d87a3f.

Before:

https://github.com/user-attachments/assets/9f84cd35-9a94-48f7-bb89-b6d90f9907e1

After:

https://github.com/user-attachments/assets/c8f41dbd-f74a-4728-8e9f-936c122f4d69

After, if I change the size of the wxTreeCtrl in CreateTreeCtrl() from 250 to 500:

https://github.com/user-attachments/assets/cf628e62-2901-4928-9fae-fe98a0cc7c70

Platform and version information

  • wxWidgets version: 3.3 master
  • wxWidgets port: wxMSW
  • OS: Windows 11 25H2
  • other: 150% DPI


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VZ

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Mar 16, 2026, 8:27:17 PM (2 days ago) Mar 16
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vadz left a comment (wxWidgets/wxWidgets#26302)

Thanks for reporting this and sorry for missing it in my testing.

We're going to have to revert the offending commit, I still have no idea what exactly is wrong with it (which is pretty worrisome), but it clearly results in problems.

Unfortunately reverting it will result in other problems (I don't remember what it fixed, but it did fix some other wrong behaviour), but I'll just have to fix them in some other way...


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