Public bug reported:

unity-settings-daemon => gsd-keyboard-manager.c has an Ubuntu specific patch 
that strips the grp: part in XKB options:
        if (n_sources < 2 || g_strcmp0 (g_getenv ("XDG_CURRENT_DESKTOP"), 
"Unity") == 0)
                strip_xkb_option (options, "grp:");

The original upstream source code is:
        if (n_sources < 2)
                strip_xkb_option (options, "grp:");

That causes a problem: we're no longer able to type e.g. Greek in
TuxPaint, because TuxPaint grabs the keyboard layout, and u-s-d then
doesn't see the layout switching shortcut.

But: if we do revert only that line of the source code to what's in upstream, 
then we get another problem: that the XKB-defined layout switching shortcut 
(e.g. Alt+Shift) doesn't update the keyboard indicator in the panel, only the 
GNOME-defined shortcut (e.g. Win+Space) does.
To solve this, I think u-s-d needs to handle ISO_Next_Group. I don't know if 
that part exists upstream, but I do know that it works fine in Fedora 20.

After solving this bug, a tiny issue will remain: that Alt+Shift inside
keyb-grabbing applications won't update the keyboard indicator. Upstream
GNOME doesn't want patches for that and may try to solve it in SDL, but
the other 2 issues described above ^ are Ubuntu-specific.

** Affects: unity-settings-daemon
     Importance: Undecided
         Status: New

** Affects: gnome-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "dont_strip_grp.patch"
   
https://bugs.launchpad.net/bugs/1315867/+attachment/4104866/+files/dont_strip_grp.patch

** Also affects: gnome-settings-daemon (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1315867

Title:
  Don't strip XKB grp

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