Use light or dark theme based on current OS colour scheme

[StrangePeanut]

Context

No response

Description

Introduce a new default 'Sync with OS' theme option that automatically uses the light or dark theme based on the current OS colour scheme. Users can override the behaviour by explicitly selecting a theme option.

This improves the overall user experience for those who regularly switch between the light and dark colour schemes. It also benefits new users who use the dark colour scheme around the clock as they no longer need to change the theme setting from default.

Mumble component

Client

OS-specific?

No

Additional information

No response

[Hartmnt]

Sounds like a good idea. Should be reasonably easy to implement once Mumble switches to Qt 6.5 https://stackoverflow.com/a/77751363

[jakub2682-tuke]

Hello , I’m new to contributing to open-source projects, and I’m looking to get involved as part of a requirement for my studies. I have some experience with C++, but I'm new to Qt. Could I take a crack at this issue?

[Hartmnt]

Could I take a crack at this issue?

Sure, have a go! If you have any questions feel free to ask here, in a newly created PR or in our Matrix chat room!

[Hartmnt]

@Krzmbrzl Are we Qt 6.5 yet?

[davidebeatrici]

Yes.

[Krzmbrzl]

No we are not. We can only require Qt >= 6.2 in order to stay compatible with Ubuntu 22.04 which ships with that version (btw. 24.04 comes with 6.4)

However, I would totally be fine with making this feature available only if Mumble has been compiled with Qt >=6.5 which can be achieved by using the preprocessor like this:

#if QT_VERSION >= QT_VERSION_CHECK(6,5,0)
    // Your code here
#endif

[Krzmbrzl]

As an aside: this issue seems rather closely related to #4420