System specfic QT styling can make FastFlix hard to use

As reported by Nick Bailey:

~/Packages/FastFlix$ QT_STYLE_OVERRIDE=Adapta python -m
fastflix

it says

QApplication: invalid style override 'Adapta' passed, ignoring it.
        Available styles: Windows, Fusion

Using either of those doesn't change the appearance, which is unchanged from
leaving out the environment variable all together. I wouldn't mind, but it
makes the application hard to use (white text on white for pull-down menu
boxes...) I thought I should report this at least. Maybe you already know
about it.

The version I'm running was cloned from the git repo a day or two ago, and
reports itself as v4.1.2. Running on Debian Bullseye, in a virtual environment
as per your instructions.

[nickbailey]

I found what may be pertinent information here: https://stackoverflow.com/questions/52426437/how-to-instruct-pyside2-application-to-use-qt5ct-settings Contrary to what’s written there, PySide2 is in fact packaged for Debian Bullseye, but without a metapackage. I copied the current FastFlix installation in to a different directory, and removed venv/lib/PySide2. Then I installed the Debian version of PySide2 like this: apt install $(apt-cache pkgnames python3-pyside2.) pyside2-tools Now outside the venv, I see all available themes:

>>> from PySide2.QtWidgets import QStyleFactory
>>> print(QStyleFactory.keys())
['Adwaita-Dark', 'Adwaita', 'Breeze', 'Oxygen', 'QtCurve', 'Windows', 'Fusion']

but on within the venv, I see:

nick@polonius:~/Packages$ cp -a FastFlix/ FastFlix-no-PySide
nick@polonius:~/Packages$ cd FastFlix-no-PySide/
nick@polonius:~/Packages/FastFlix-no-PySide$ rm -rf venv/lib/python3.9/site-packages/PySide2

I then edited the activate script to change the venv directory and made a link from the old PySide2 to the system one /usr/lib/python3/dist-packages/PySide2 This causes the theme to be used, but the pull-down menus are stiill white-on white. Changing the application style to Adwita in the control panel makes the menus readable (just) although something sitll isn’t quite right.

[cdgriffith]

Marking this as done as this is hopefully fixed and hasn’t been a follow up. If there is still any issues please report back and can reopen. Thanks again for bringing it to my attention!