UI: Task view width unbounded (with Terminus font) (is an upstream Qt issue)

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Problem description

I double-clicked on a Part Fusion in the Tree view, and the Task view exploded in size.

In the same session I was using sketcher, and the task view didn't behave oddly there. A list of things I've done in the past day that could maybe have caused it:

~~1. I've changed from FreeCAD_weekly-builds-37100-conda-Linux-x86_64-py311.AppImage to FreeCAD_weekly-builds-37213-conda-Linux-x86_64-py311.AppImage~~
2. I've **made some tweaks to system fonts** via fontconfig to diagnose other issues
~~3. I've moved Tree view and Selection view from outside the main window to inside, then back again a few times to diagnose yet another reported issue~~

### Full version info

```shell
OS: Gentoo Linux (KDE/plasma)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37213 (Git) AppImage
Build type: Release
Branch: main
Hash: 20e7deb86a8c6c2cd2378f09f8313760933f3a5c
Python 3.11.9, Qt 5.15.13, Coin 4.0.2, Vtk 9.2.6, OCC 7.7.2
Locale: English/United States (en_US)
Installed mods:
* parts_library
* Curves 0.6.36
* A2plus 0.4.64a
* DynamicData 2.62.0
* Assembly4 0.50.12 (Disabled)
* Alternate_OpenSCAD 1.0.0
* CurvedShapes 1.0.9
* fasteners 0.5.20
* SearchBar 1.0.2
* Nodes 0.1.36 (Disabled)
* workfeature
* MnesarcoUtils 0.2.5
* Manipulator 1.5.7
* Assembly3 0.12.2
* lattice2 1.0.0
* Launcher
* CommandPanel
* CubeMenu
* PieMenu 1.5.0
* MeshRemodel 1.9.23
```

### Subproject(s) affected?

Other (specify in description)

### Anything else?

I've seen this happen in other Qt apps. KDE has one seldom used dialog that has MAX_INT horizontal dimension. I can "fix" it with a window manager rule. The screenshot was taken after moving Tasks out of the window (it was unbounded when docked as well). This is a 4 monitor setup, one on top of 3.

Related: https://github.com/FreeCAD/FreeCAD/issues/11016
~~Possibly caused by: https://github.com/FreeCAD/FreeCAD/pull/13611 (which I see has been reverted)~~

### Code of Conduct

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