[PATCH try2] [bug9324] user32: Fix segfault when combobox contains a longer text than buffer_limit

[Alex Busenius]

Hello,

I have sent this patch a couple of months ago, but in wrong format, I 
hope it's better this time.

This patch fixes the problem with comboboxes having fixed text length. 
For such comboboxes, it is still possible to display a longer text if it 
is set manually, but a user is not able to input a longer text any more.

The current implementation is not aware of this behaviour, and this 
causes negative length in a calculation and a segfault later as soon as 
a user tries to delete some characters in such combobox.

This problem is also described for Mp3Tag in bug #9324

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