bug#55331: Improved support for combining diacritics

[Benson Muite]

Hi,

Unicode allows for combining diacritics. When using
grep -E 
"\s[a-z\`\'āáàēéèīíìịị̄ị́ị̀ōóòọọ̄ọọ́ọ̀ūúùụ̄ụ́ụ̀n̄ńǹm̄ḿm̀]{4}$"

to extract 4 letter Igbo words from a text, akụ̀ is incorrectly 
classified as a 4 letter word, when it is a three letter word.  Would a 
patch to fix this be accepted?

Regards,
Benson Muite