Can you paste the utf8 string into a comment here, please.

The bug is against F10?

the bug is against F10,
when I input  0D07 0D28 0D4D 200D 0D38 0D4D 0D31 0D4D 0D31
0D4B 0D33 0D4D 200D 0D21 0D4D 0D30 0D48 0D35 0D4D,it will generate ഇന്‍സ്റ്റോള്‍ ,
I need press 14 times backspace key to delete it.I should use 13 times backspace key to delete it.

So F11 is ok?

(In reply to comment #3)
> the bug is against F10,
> when I input  0D07 0D28 0D4D 200D 0D38 0D4D 0D31 0D4D 0D31
> 0D4B 0D33 0D4D 200D 0D21 0D4D 0D30 0D48 0D35 0D4D,it will generate
> ഇന്‍സ്റ്റോള്‍ ,

'pasted string' and 'number of rawcode character' (19) looks different from one which reported in description of problem

The Unicode character sequences given only in the initial "Description of Problem" are correct. Everywhere else 19 characters are mentioned. 

The real problem is of split matra. The 10th character U+0D4B, is split into two characters, U+0D47 and U+0D3E at the time of rendering, which is adding to the extra backspace. 

This does not harm the usability in any way, hence this should not be considered as a bug, unless there is an authentic report of the script behaviour given by any user of the script.

Any updates?

there is problem with pango
its doing normalization of 0d4a  kind of characters into 

0d46 + od3e
so while backspacing it takes one extra space

there are some bug files for same thing, i will try to find such bug and close this one

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hmm, this bug is still there in rawhide
might be it will get fixed auto with harfbuzz and pango merger

This bug appears to have been reported against 'rawhide' during the Fedora 13 development cycle.
Changing version to '13'.

More information and reason for this action is here:
http://fedoraproject.org/wiki/BugZappers/HouseKeeping

Is this issue known in upstream? otherwise can you please file a bug upstream? also good to test this on f15 too.

Yes, This is fixed now !!

pango-1.28.4-1.fc15.x86_64

step to check

1) enter Unicode 0D4A with ibus-rawcode or any other method
2) press backspace
3) complete character getting deleted (earlier it was required two backspaces)

upstream bug id https://bugzilla.gnome.org/show_bug.cgi?id=345066