I believe the most serious objection with this request is that it
violates the XKB specification (see the description of SA_LockGroup in
section 6.3 of "The X Keyboard Extension: Protocol Specification").
In the same specification, in section 4.0 of appendix D ("Protocol
Encoding"), we see in the description of SA_LockGroup that there are
still 5 unused bits in the flags field. My proposal in to use one of
these bits decide whether to lock groups on press or release. By
default (bit is zero), lock groups on press as the protocol
specification demands. If the flag is one, lock groups on release. So
by default, we would conform to the specification, and add the
alternative behaviour as a new possibility beyond the specification.
There are some usage implications. One must use 'Private' do create
actions with the new flag set (until xkbcomp is updated as well), and
one needs support in xkeyboard-config to make the new feature usable for
non-XKB-hackers.
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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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