Created attachment 185375 [details] A Screenshot Of The Colour, Suggested In The Colouration KCM # SUMMARY When the user chooses a custom accent colour that matches the base colour scheme “too well”, so-to-speak (as a layman), the consequent lack of contrast may cause at least `QProgressBar`s’ progress indicators to become invisible. # STEPS TO REPRODUCE 1. Invoke `kcmshell6 --highlight kcm_colors`. 2. Install `plasma-discover kns://wallpaperplugin.knsrc/2139746`. [^1] [^2] 3. Apply it as the wallpaper (without any media). 4. Apply `lookandfeeltool --apply org.kde.breezedark.desktop`. 5. Apply `#686b6f` as the custom accent colour (when suggested). Thereafter, download an update via Discover, or transfer a file via Dolphin. # OBSERVED RESULT `QProgressBar`s’ progress indicators to become invisible # EXPECTED RESULT Their outlines should be defined, and/or their opacity should differ. # SOFTWARE/OS VERSIONS > ~~~ > Operating System: Fedora Linux 42 > KDE Plasma Version: 6.4.5 > KDE Frameworks Version: 6.18.0 > Qt Version: 6.9.2 > Kernel Version: 6.16.8-200.fc42.x86_64 (64-bit) > Graphics Platform: Wayland > ~~~ # ADDITIONAL INFORMATION This might be better filed against the Breeze QStyle or QQuickStyle. --- Citations: [^1]: https://github.com/luisbocanegra/plasma-smart-video-wallpaper-reborn/issues/148#issuecomment-3189502992:~:text=following%20the%20DE's%20colour%20scheme [^2]: https://bugs.kde.org/show_bug.cgi?id=509232#c0:~:text=%3E-,plasma%2Ddiscover%20kns://wallpaperplugin.knsrc/2139746,-%3E%20~~~ Relevant software: > ~~~ > Name : kf6-kcolorscheme > Version : 6.18.0 > Release : 1.fc42 > Architecture : x86_64 > Install Date : Mon 22 Sep 2025 23:56:50 BST > Size : 241911 > Signature : RSA/SHA256, Sat 20 Sep 2025 09:56:33 BST, Key ID c8ac4916105ef944 > Source RPM : kf6-kcolorscheme-6.18.0-1.fc42.src.rpm > Build Date : Fri 19 Sep 2025 14:21:40 BST > Build Host : buildhw-x86-03.rdu3.fedoraproject.org > Packager : Fedora Project > Vendor : Fedora Project > URL : https://invent.kde.org/frameworks/kcolorscheme > Bug URL : https://bugz.fedoraproject.org/kf6-kcolorscheme > ~~~
Created attachment 185376 [details] A Screenshot Of A Dolphin Transferral Plasma Notification
Created attachment 185377 [details] A Screenshot Of A Discover Download Progress Indication Bar
Meanwhile I agree this is not ideal, some colors just are not good accent colors due to this. I think the solution here is for the user to not use that color. Still, maybe we should not suggest that color in the color KCM. Will mark this as not-a-bug, but I will share it with others, who can reopen it if this seems like something actionable.
Created attachment 185389 [details] AOSP 15's Comparable B&W Accent Suggestion (In reply to Akseli Lahtinen from comment #3) I really, really like this colour: I hate having my interfaces colourful, and I was always able to choose even 50% grey on Windows (whose dark mode's colour scheme isn't blue-grey). AOSP even offers me a B&W theme in its suggestions, so KDE Plasma is the sole DE I've utilised thus far that doesn't cope with it. I'd say that, if an interface relies upon colours to distinguish between components, that's a slight accessibility failure, especially since https://invent.kde.org/plasma/kwin/-/merge_requests/8106 exists.