I just avoid GTK apps as much as possible, thankfully the few I do use look decent enough but only because they follow darkmode atleast.
KDE
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
Plasma 6 Bugs
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
PLEASE THINK CAREFULLY BEFORE POSTING HERE.
Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Here's the thing though : Flatpaked KDE apps look perfect on GNOME. So I'd like to be able to use the same set of apps on both.
I made some notes while I had a problem with Zim flatpak not following Breeze GTK theme:
https://docs.flatpak.org/en/latest/desktop-integration.html#applying-themes //The applications will try to match the system theme currently being used, if it corresponds to any of the Flatpak themes installed, and will fall back to Adwaita (if they use Gtk2 or Gtk3) or the default Qt theme (if they use Qt) if a corresponding theme isn’t detected.//
== Solution: ==
''flatpak override --user --filesystem=xdg-config/gtk-3.0:ro''
Source: https://github.com/flathub/org.gtk.Gtk3theme.Breeze#workarounds
( I tried to install ''org.gtk.Gtk3theme.Breeze-Dark/x86_64/3.22'' but //"This theme has been replaced by org.gtk.Gtk3theme.Breeze, see README for workaround on using system color schemes. https://github.com/flathub/org.gtk.Gtk3theme.Breeze#workarounds"////////
Context: Kubuntu 22.04 KDE Plasma 5.24.7
So I executed flatpak override --user --filesystem=xdg-config/gtk-3.0:ro
and it didn't output any error, but it changed nothing regarding apps that look bad, unfortunately...
Thanks
Did you install the Flatpak org.gtk.Gtk3theme.Breeze ?
You can check by running flatpak list
Yes : Breeze GTK theme org.gtk.Gtk3theme.Breeze 6.2.5 3.22 flathub system