bug#5256: conjunct formation should follow input sequence when inserting text

[Praveen A]

Example to illustrate this bug is അപ്‌ലോഡ് (upload).
>>> a=u'ലോഡ്'
>>> b=u'അപ്'
>>> c=u'അപ്‌ലോഡ്'
>>> print repr(c)
u'\u0d05\u0d2a\u0d4d\u200c\u0d32\u0d4b\u0d21\u0d4d'
>>> d=u'അപ്ലോ‌ഡ്'
>>> print repr(d)
u'\u0d05\u0d2a\u0d4d\u0d32\u0d4b\u200c\u0d21\u0d4d'
>>>

Here ZWNJ is added to prevent formation of conjunct 'pla' (\u0d2a\u0d4d\u0d32).

Enter ലോഡ് (\u0d32\u0d4b\u0d21\u0d4d) first, move cursor to the
beginning of the word, now enter അപ് (\u0d05\u0d2a\u0d4d). Now ZWNJ
entered will not be after 0d4d, but after the conjunct 'plo'
(\u0d2a\u0d4d\u0d32\u0d4b). gedit/pango has the correct behavior,
wherein the ZWNJ is inserted after 0d4d breaking the conjunct 'pla'
(\u0d2a\u0d4d\u0d32) as expected.

GNU Emacs 23.1.90.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.18.3)
 of 2009-12-18 on savannah
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