Isn't this a duplicate of #1226969 ?
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https://bugs.launchpad.net/bugs/1244548
Title:
Keyboard shortcut for changing keyboard layout does not work on lock
Just to add some info, you can get Ctrl-PgUp/PgDn to switch tab using a plugin.
See the comments on http://live.gnome.org/Gedit/KeyboardShortcuts.
(Direct link to plugin:
http://live.gnome.org/Gedit/Plugins?action=AttachFile&do=get&target=tabpgupdown.tar.gz)
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gedit keyboard shortcuts
https://