Theme doesn't apply to QT5 apps

[colin-intj]

Hello! Thank you for bringing back Lightly, it's quite possibly my favorite KDE theme and I'm glad I can finally use it in Plasma 6! I've noticed that, even when I set Lightly as my application style, QT5 apps still use Breeze.

QT6 app (Dolphin) and QT5 app (qView) side-by-side

Would it be possible for you to make the theme work for Qt5 apps as well? Thanks!

[Bali10050]

I'm 99% sure that you have a problem with your xdg-desktop-portal. Try installing xdg-desktop-portal and xdg-desktop-portal-kde.

https://wiki.archlinux.org/title/XDG_Desktop_Portal

[subhasutra]

For me VLC still uses breeze. And the desktop portals are working fine for other apps.

[meisaamayako]

Can confirm this one. VLC and other QT5 apps do not use Lightly at all. both xdg-desktop-portal and xdg-desktop-portal-kde are installed as well.

Operating System: Arch Linux 
KDE Plasma Version: 6.2.3
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.0
Kernel Version: 6.11.8-zen1-2-zen (64-bit)
Graphics Platform: Wayland
Processors: 4 × 11th Gen Intel® Core™ i3-1115G4 @ 3.00GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics
Manufacturer: LENOVO
Product Name: 81X8
System Version: IdeaPad 3 15ITL05

[Bali10050]

I'm not sure what the best solution would be, I don't think that bringing back qt5 for vlc is a good idea, while vlc has a new ui in development:

[DeltaCopy]

To get this to work the CMakeLists will need updating to include the QT5/KF5 build dependencies.
@Bali10050 let me know your thoughts as we've already removed those dependencies before.
Supporting both QT5 and QT6 builds is achievable but is it the correct path going forward, especially as Plasma has moved to QT6.

@colin-intj qview has already been ported over to QT6 so the Lightly style will work natively.
Which distro are you using ?

[colin-intj]

Sorry for the late reply. I'm currently running Fedora 41.

[colin-intj]

Sorry for the late reply, @Bali10050. Like @meisaamayako, I also already have xdg-desktop-portal and xdg-desktop-portal-kde installed.

[Bali10050]

@DeltaCopy if you have something working, we can add it as an option, but if not, I don't think it's a good idea to start working backwards.