Here's a screenshot of the seemingly relevant settings.
Alt+Tab (Forward) works; Alt+Shift+Tab (Reverse) does nothing.
Any suggestions for a fix or where exactly I should direct a bug report?
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It looks like the reason is that Alt+Shift+Tab translates to Alt+Shift which switches the keyboard layout and consecutive Alt+Tab which traverses the opened applications in the non-reversed order. I think this is a bug and it is really uncomfortable for anyone with more than one keyboard layout.
It looks this is an old bug which was fixed
However in Kubuntu 18.04 it appears again.
09:40:05:~$ plasmashell --version plasmashell 5.12.6 09:40:10:~$ kf5-config --version Qt: 5.9.5 KDE Frameworks: 5.44.0 kf5-config: 1.0
It's indeed considered a somewhat "bug"-ish, yet it also depends on the perspective...
Meanwhile, however, just in case, have you tried: CtrlAltTab instead of AltShiftTab?
It may be a temporary workaround if AltShift is set in Xorg for layout switching/toggling (i.e.
grp:alt_shift_toggle) and considering the following:
The X server does not know about any shortcuts -- shortcuts are the domain of the desktop environment. Maybe in Windows layout-switching and shortcut-recognition happen in the same component, so it can hold off switching layouts until Shift and/or Alt is released to see if maybe another key will be pressed. But in X, layout switching happens in the server, and as soon as the switching combo is seen, the layout is switched and the combo is dropped.
Source: GitLab (freedesktop.org)
It depends on the current shortcuts and may indeed appear non-comfortable enough (subjective...), yet the wonderful Ctrl key is near Shift on the most of the keyboards and may have been waiting all this time just for you! ^^