The following comments were made by Peter Hutterer (an X.org input developer) on the corresponding bug in RedHat bugzilla ( https://bugzilla.redhat.com/show_bug.cgi?id=660254 ): (In reply to comment #6) > implementing this behaviour requires guesswork that I'm not sure is safe in a > number of setups. ... > afaict, the desired behaviour for a ctrl+shift groupchange is: > ctrl down → set Control modifier > shift down → set Shift modifier > if (other key pressed) > send event Contrl+Shift+<other key> > else if (ctrl || shift released) > change group > > The XKB map for left control in this case is: > key <LCTL> { [ Control_L, ISO_Next_Group ] }; > So whenever ISO_Next_Group is pressed, you still need to know which modifier > to > set in case the group action isn't executed. The XkbSA_SetMod, XkbSA_LockMod, > etc. actions provide the modifiers set for a given key, hence why it works > currently. This information comes from the client when the xkb map is loaded > and is used to trigger the modifier flags for a given key. The XkbSA_LockGroup > behaviour (which is triggered at ISO_Next_Group) does not have this field > (adding it would break ABI), so you need to guess which modifiers to set if > you > didn't trigger this action. This is the main stumbling point that I found and > if you look at Ilya's patch that's where he needs the big hack that I'm not > comfortable at all with it. > > Now, I don't know if there are layouts where the modifier mask would be > different on the second level as opposed to the first (and Ilya's hack or a > similar attempt would fail completely) but there's so many layouts that it'll > take a while to get through them all.
Ilya - this is hardly my area of expertise, so if you can address these issues - either by commenting here, on the RedHat bugzilla or by changing the patch - I would greatly appreciate that. Thanks to all the people who are involved, and lets keep the communication channels open :-) -- You received this bug notification because you are a member of Ubuntu 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 To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-control-center/+bug/36812/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
