Description of problem:
for Indic Langauge, Delete with Backspace having problem with some specific cases.
Somewhere Undo action behaving in most unpermissable and ridiculas way!!


Version-Release number of selected component (if applicable):
evolution-2.11.92-3.fc8
gtkhtml3-3.15.92-1.fc8

How reproducible:
Everytime

Steps to Reproduce:
Login with Oriya Language
2. Open Evolution --> New Mail
3. Go to the message body.
4. Enable SCIM with pressing CTRL+SPACE & choose Oriya inscript IME.
5. write the key sequence : mcdheovj
6. Press left-arrow key 3 times
7. Press backspace 3 times
8. It should delete 'e' 'h' and 'd' only. 
   Its deleting 'c' and specially 'm' also which is a consonant and placing 
   independently not with any conjunct.
9. Now, try with pressing CTRL+z to undo the delete and take back the full word.
10. Its not taking back the full word as before.
(_Please copy to original word and paste once and then try to pasted word,
so make easy to understand_).


Actual results:
It should delete 'e' 'h' and 'd' only. Its deleting 'c' and specially 'm' also
which is a consonant and placing independently not with any conjunct.
Its not taking back the full word as before.


Expected results:
The Delete with backspace should maintain its rule to delete chars or composed
chars within a word. And Undo should revert it back properly in its previous state.

Additional info:
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ସମà­à¬ªà¬¾à¬¦à¬¨à¬° (normal word)
ସପମà­à¬¦à¬¾à¬¨à¬° (after Backspace and Ctrl-Z word)
સમà«àªªàª¾àª¦àª¨àª° (normal word)
સપમà«àª¦àª¾àª¨àª°
সমà§à¦ªà¦¾à¦¦à¦¨à¦° (normal word)
সপমà§à¦¦à¦¾à¦¨à¦°
ஸமà¯à®ªà®¾oநர (normal word)
ஸமà¯à®ªà®¾oநர

ಸಮà³à²ªà²¾à²¦à²¨à²°  (normal word)
ಸಪಮà³à²¦à²¾à²¨à²°
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