The same letter is not considered as the same letter

I am using KDE 4.10 with Turkish localization.

The translation of Pointer Theme is: İmleç Teması.
But when I write "imleç" on Kickoff, it does not find it. The only way to let it find is using capital "i" which is "İ" in Turkish (not "I". with dot at the top).

Reproducible: Always

Steps to Reproduce:
1. Change locale into Turkish
2. Logoff and Login
3. Search for İmleç and imleç, the former one will be found while the latter will not.
Actual Results:
It should find since typing to search is not case sensitive.

Expected Results:
It does not find if you type in small letters instead of capital letters.

Another example is Yer İmleri which means Bookmarks.

You can also create a folder or file in Dolphin starting with "İ" and typing to highlight it.

Note that this does not affect other characters in Turkish charset.

The original bug report is here: https://bugs.kde.org/show_bug.cgi?id=316077