Comment 29 for bug 1278569

Re: #20 - it looks like it is upstream that changed to super+space, not Debian:
 https://github.com/ibus/ibus/releases

1.5.3: Release 1.5.3 Takao Fujiwara fujiwarat released this on Jul 26, 2013.... This version changes the default hotkey from Control + space to Super + space. You can customize the hotkey with ibus-setup.

The code changes (to more than just the xml file, Jorge) are here:

Defalut triggers key is changed to <Super>space. · f3d80dc · ibus/ibus
 https://github.com/ibus/ibus/commit/f3d80dc026853c1024cdf6bda31b1496939cb095

So Ubuntu is overriding upstream! Why?

Aha - it is patched back to ctrl-space in patches/ibus-xx-ctrl-space.patch as a "transitional solution in trusty" because of this bug in gnome-settings-daemon I guess:

Bug #1249208 “Avoid conflicting <Super>Space shortcut with g-s-d...” : Bugs : “ibus” package : Ubuntu
 https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1249208

Trusty LTS is not a release to be doing transitional solutions in....

This bug among other things has caused me to lose data in emacs, because set-mark-command doesn't work from ctrl-space like it has for what, decades? And my fingers expect it to continue to work that way. I set the mark and delete the region as a muscle macro. Very dangerous.

This needs to work right for all the desktops, rather than breaking it for everything except one desktop.