how to enable git diff in qt creator shows the spaces.

Hi, I don't know is it could be a bug. I post it here, because I couldn't find the answer in other places. I recently use git diff in qt creator. When I use this IDE and then create the patch. I found the qt creator ignore the spaces in the patch. But this difference will be shown when I use command line to git diff. Because my manger require a very clean patch, this bug annoy me a lot. I always need to do some indentation by myself. I know there is an option to let git diff to ignore the spaces. But for me , I would like it could shows the spaces