Kvantum is a QStyle plugin, so it only ever painted the three QWidget
apps we ship, and it painted them with its own stock look: Omarchy has
never shipped a .kvconfig, so nothing about it tracked the active theme.
Without it Qt falls back to built-in Fusion while the palette still comes
from QT_QPA_PLATFORMTHEME=gtk3, so everything stays dark and now follows
the theme instead of ignoring it. Measured across a full 1920x1080 frame,
dropping it moves obs-studio by 132 pixels -- it overrides the platform
style with its own stylesheet anyway -- kdenlive by 0.8%, and the
Hyprland share picker by 4.7%. Flatter buttons, classic tabs, a
conventional checkbox tick.
Existing machines get a migration, which the Qt5 stack never did. The
difference is that this removal cannot reach the greeter. kvantum-qt5
goes in the same transaction, since it is the only thing that requires
kvantum, and it takes qt5-svg and qt5-x11extras along with it -- but
qt5-wayland is explicitly installed, so the cascade stops there and
leaves qt5-declarative and qt5-base standing for any sddm theme still
starting the Qt5 greeter.
kvantummanager stays in launcher.hides. The entry costs nothing once the
package is gone, and it keeps Kvantum Manager out of the launcher on
machines that have not run the migration yet.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
