Describe the bug

If a CollapsingHeader widget appears as the first child of a window Ui, it cannot be interacted with:

This seemingly only applies to direct children of a window. The first collapsing header in the "Inspection > Input" section, for instance, works just fine.

To Reproduce
Steps to reproduce the behavior:

1. Open the "Settings" window in the demo app from the left pane
2. Try to open the "Font tweak" section
3. Note how it's not interactable--the header does not have any hover effect, and clicking on it does nothing

Expected behavior
The header should be clickable, like all the others

Screenshots
See the above screen recording

Desktop (please complete the following information):

• OS: Tested on Linux and WebAssembly
• Browser: Firefox