Found partial workaround today.
It _is_ possible to setup xkb so that the group (i.e. layout) switch
occurs on <Shift>+<Alt> (which means press and hold Shift, then press
Alt - order matters) - and still <Alt>+<Shift>+<something> (first alt,
then shift, then something) shortcuts work. All this without the need to
recompile xserver.
Here's what I did:
$ setxkbmap us,cz
(just load the layouts I want to the server, switching not working yet)
$ xkbcomp $DISPLAY xkbdesc
(list the xkb description from server to a file named "xkbdesc")
Now two little changes to xkbdesc:
change1:
key <LALT> { [ Alt_L, Meta_L ] };
to
key <LALT> { [ Alt_L, ISO_Next_Group ] };
change2:
key <RALT> {
type[group1]= "TWO_LEVEL",
type[group2]= "ONE_LEVEL",
symbols[Group1]= [ Alt_R, Meta_R ],
symbols[Group2]= [ ISO_Level3_Shift ]
};
to
key <RALT> {
type[group1]= "TWO_LEVEL",
type[group2]= "TWO_LEVEL",
symbols[Group1]= [ Alt_R, ISO_Next_Group ],
symbols[Group2]= [ ISO_Level3_Shift, ISO_Next_Group ]
};
then
$ xkbcomp xkbdesc $DISPLAY
(load kbdesc to the server; ignore the warnings)
and voila! Shift+Alt (in that order) switches us<->cz keyboard and
Alt+Shift+Tab works like it should.
I was actually quite surprised when I found this.
PS: Next time you start X, you can do just the last step, supposed you
keep the xkbdesc file.
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Bugs, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/36812
Title:
Keyboard layout change on hotkeys press instead of release and do not
work well with shortcuts
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