Part Library browser cannot access hidden directory below "~/.local"

- installed part library using addon manager
- called macro as instructed
- can browse file tree, but not access part library location
- opening part library in addon manager, I find the installation path:
`/home/username/.local/share/FreeCAD/Mod/parts_library`
but cannot open this location, since **directory names starting with a dot** are **hidden** in standard GUI
- don't know how the file browser of the GUI is configured, but I can't find a location to enter/show hidden directories
- **workaround:** create a non hidden symbolic link, e.g.
`_local_share_FreeCAD -> /home/username/.local/share/FreeCAD`

system details:
```
OS: Debian GNU/Linux 10 (buster) (LXDE/LXDE)
Word size of FreeCAD: 64-bit
Version: 0.21.2.33771 (Git) AppImage
Build type: Release
Branch: (HEAD detached at 0.21.2)
Hash: b9bfa5c5507506e4515816414cd27f4851d00489
Python 3.10.13, Qt 5.15.8, Coin 4.0.0, Vtk 9.2.6, OCC 7.6.3
Locale: German/Germany (de_DE)
Installed mods:
* fasteners 0.5.12
* slic3r-tools
* Pyramids-and-Polyhedrons
* A2plus 0.4.63
* Assembly3 0.12.2
* Assembly4 0.50.7
* FeedsAndSpeeds 0.5.0
* dodo 1.0.0
* frame 0.1.1
* freecad.gears 1.2.0
* Manipulator 1.5.7
* MOOC 2022.4.21
* Help 1.0.3
* ose-piping
* QuickMeasure 2022.10.28
* sheetmetal 0.4.2
* ThreadProfile 1.89.0
* SteelColumn
* Estimate 0.1.2
* DynamicData 2.60.0
* parts_library
```