Both Arch Linux (plasma 5.14 beta) and neon dev unstable are affected.
The problem affects for example system tray settings, task manager settings, kicker/dashboard settings, digital clock settings, desktop settings and some widgets settings.
The following link contains several screenshots taken on Arch Linux.
I can confirm. Somehow Breeze doesn't style the dropdown properly again :/ That used to work
(In reply to Kai Uwe Broulik from comment #1)
> I can confirm. Somehow Breeze doesn't style the dropdown properly again :/
> That used to work
Code in breeze with respect to comboboxes has not changed for months. So this must be some chain reaction from another upstream change (Qt, QtQuick controls, whatever).
Git commit 3e8eac8fc461e35614c3f297fb1ac99ad1c18e53 by Kai Uwe Broulik.
Committed on 17/09/2018 at 08:11.
Pushed by broulik into branch 'Plasma/5.14'.
Fix finding QtQuick
It is QtQuick_FOUND, not Qt_Quick_FOUND. This broke all special-casings for QtQuick,
such as "drag on empty area" in QtQuick windows and ComboBox popups.
Differential Revision: https://phabricator.kde.org/D15568
M +2 -2 kstyle/CMakeLists.txt
*** Bug 398598 has been marked as a duplicate of this bug. ***
*** Bug 398666 has been marked as a duplicate of this bug. ***
*** Bug 398599 has been marked as a duplicate of this bug. ***
*** Bug 398600 has been marked as a duplicate of this bug. ***