Git bug. gitattributes' pattern does not respect spaces in the filenames

Hello everyone!

There's a description for the understanding of a situation. I have a project on Windows. I use Git under Cygwin. There are some *.xml in the project. But some of them are in cp1251 encoding, another ones are in UTF-8. For the first ones there is no need of any conversion to see the git-diff, but for the *.xml's in UTF-8 I set

*.xml diff=utf8-to-cp1251

And according to this I have $ git config diff.utf8-to-cp1251.textconv 'iconv -f utf-8 -t cp1251'

Unfortunately, *.xml's in cp1251 DOES match this pattern, too. As far as cp1251 and UTF-8 files are in different folders, it is logically enough to set pattern like

<folder with a UTF-8-xmls>/*.xml diff=utf8-to-cp1251

for the UTF-8 files. BUT! Unfortunately, <folder with a UTF-8-xmls> have spaces in its name, so textconv filter does not work because of error of parsing .gitattributes

I have no enough skills to patch Git to fix this error. Is anybody interested in to do?

Thanks