There's a bug when changing Wallpaper Plugin. Left Clicking to open the ComboBox's drop down menu, then left clicking a different plugin will not switch the GUI. Scrolling over the ComboBox works though. Eg: https://www.youtube.com/watch?v=5S3_OsyJkiw There was a Kirigami.FormLayout + QtQuickControl2 patch that changed QtControls1.ComboBox.onCurrentIndexChanged * https://github.com/KDE/plasma-desktop/commits/master/desktoppackage/contents/configuration/ConfigurationContainmentAppearance.qml * https://github.com/KDE/plasma-desktop/commit/c2640f83f1077365cd7f87ca2adbfbfb12cf4da7#diff-95d96a95e58373ce46189786eca598f8L144 to QtControls2.ComboBox.onActivated * https://github.com/KDE/plasma-desktop/commit/c2640f83f1077365cd7f87ca2adbfbfb12cf4da7#diff-95d96a95e58373ce46189786eca598f8R108 I also noticed the CombBox no longer updates when a wallpaper plugin is installed which https://phabricator.kde.org/D15178 added. The "Layout: Folder View" => "Layout: Desktop" ComboBox also displays this bug. The Image wallpaper plugin's "Scaled and Cropped" ComboBox is still using QtQuickControl1.onCurrentIndexChanged so it does not have this bug. * https://github.com/KDE/plasma-workspace/blame/master/wallpapers/image/imagepackage/contents/ui/config.qml#L91 Neon's gitunstable ISO has Qt 5.11.2 QtQuickControls2 ComboBox * https://doc.qt.io/qt-5.11/qml-qtquick-controls2-combobox.html
There was a bug in QQC2 combobox with the desktop theme. Should be fixed.
581b140c8b81096f40ddebd84b8b2fbc327b616d in qqc2-desktop-style.
https://github.com/KDE/qqc2-desktop-style/commit/581b140c8b81096f40ddebd84b8b2fbc327b616d I can confirm that Neon's /usr/lib/x86_64-linux-gnu/qt5/qml/QtQuick/Controls.2/org.kde.desktop/ComboBox.qml is using `model` on line 72 + 210 instead of `delegateModel`. After modifying the file and restarting plasmashell, the bug was fixed. :)