Remove leading and trailing whitespace in diff

[shauryagoel]

I want to highlight only the changed text without highlighting the leading and trailing whitespace characters. For example-

In the above diff image, I want to highlight the "requests:" text in line 197. However, if I change the "minus-style" field in the gitconfig, I am only able to highlight the complete line not only the "requests" text. How can I avoid that?