I have done some testing using different applications and different input mode 
settings on Ubuntu Saucy, and i notice that there are some differences 
concerning keyboard shortcuts, depending on the application used. Long story 
short, while on LibreOffice and Chromium Browser we can see a stable behavior 
regardless of the input mode used, Gedit seems to be reacting differently to 
some actions.
I am attaching a screenshot of an analysis table for these tests, in hope that 
this will be helpful to the dev team. If more testing is needed, i 'll be glad 
to help out.

On the matter that if the layout shortcut changes then it cannot be
reverted back to default, i saw that when trying to set the layout
shortcut back to Super+Space in the Text Entry Settings window, then the
input is read as Mod4+Super+Hyper+Space, so one cannot revert to default
any more. But when trying the exact same thing through System Settings >
Keyboard > Shortcuts > Typing, then the Super+Space shortcut is read
correctly and the user can revert to default. Maybe there are some
differences between the two setting modes?

So that leaves the matter of the available layout changing shortcut. Please, 
let me explain briefly why this is so important.
In many non-English documents, we can find a lot of words written in English, 
such as technological terms, names, brands, product model names, and even 
measurement units. This is not a problem for a  non-English speaking but user 
as long as the user's language uses the latin alphabet. That is because at this 
case, English characters are a subset of the user's native layout. For example, 
a French user can type any English word using the French layout. 
This is not the case for Greek or Cyrillic alphabet language users, as no Latin 
characters are part of the Greek or Cyrillic layout. This means that in a 
single page of document, one may need to change layouts up to 100 times (50 
from native to Latin and 50 back to native). That gets even worst when 
shortcuts like cut/copy/paste do not work in native layout, so additional 
layout changes must be made.
So, it is clear that something that is used so often, should be as convenient 
as possible. That means thta the layout changing shortcut should:
- Be enabled by just one hand (ideally the left one, as the right hand controls 
the <Enter>, <Backspace>, etc).
- Contain as less keys as possible (preferably just one, two at the most), that 
are located close to each other.
This sets a limit to the lower left side of the keyboard. The Alt+Shift is not 
considered an ideal solution, but due to its long time usage from a widows 
user, is achieved relatively easy. Even better alternative solutions, are the 
Ctrl+Shift shortcuts (offered also as an alternative on Windows), and plain 
Caps Lock key (available also in Windows machines via AutoHotKey application). 
I am referring to windows because a lot of users are dual booting, or even use 
windows machines in work environments, so there should be some compatibility of 
something used so much.

My sincere apologies for the length of my comment and for pointing out
things that may be obvious, my intention was just to make sure that a
point haw been made about why this is an important bug, as it so far
renders the 13.10 as unsuitable for everyday use.

** Attachment added: "Analysis on using greek layout with different 
applications"
   
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1228422/+attachment/3834215/+files/greek-layout-saucy.png

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https://bugs.launchpad.net/bugs/1228422

Title:
  Severe regressions to typing in Greek, Russian, etc due to IBus

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