.qbttheme doesn't work across different Qt versions.

[jagannatharjun]

.qbttheme is basically a Qt's rcc compiled resources object, this works almost correctly but one big problem is that format seems to differ across different Qt versions that limit qbttheme to be used only with a specific qt version. This is fine on windows, but kinda causing issues for Linux users since there Qt is system provided. It's a bit cumbersome to provide qbttheme for every different Qt version out there.

One possible solution is something like this #12142
but it's mostly dependent on maintainers' choice I guess.

[jabbermacy]

same issue here, v4.3.3, ZorinOS16, NO theme I try works at all

[sparrowrifu]

same problem in v4.3.3 on Ubuntu

[Martinligabue]

Flatpak version is working

[b-user]

.qbttheme is basically a Qt's rcc compiled resources object, this works almost correctly but one big problem is that format
seems to differ across different Qt versions that limit qbttheme to be used only with a specific qt version.

as far as I know there are few variant:
Qt Resource Compiler
--format-version The RCC format version to write (1, 2, 3)
--compress-algo Compress input files using algorithm (zstd, zlib, none).
PS. Zstandard compression requires format version 3.

qBittorrent 4.5.0 (build for windows) does not support Zstandard compression: "Failed to load UI theme from file: "C:_QbIT\zstd-v3.qbtheme"
I have tested all format version (1,2,3 ); (with zlib compression and "none" compression) on ubuntu-22.10-desktop-amd64.iso livecd & elementaryos-6.1-stable.20211218-rc.iso (qBittorrent 4.5.0, AppImage (lt20) from fosshub) and windows 10/11.
All work perfectly.

It seems to me that the problem is not in the version nor compression of the rcc.

[SolidGlenn]

It wont work directly by pressing apply;
You just need to restart.

Confirmed in v4.4.1 (64-bit)

[Kenny-Dave]

It wont work directly by pressing apply; You just need to restart.

Works for me in Mint Cinnamon.