why git is considering the whole file changed while just a part of it is changed

Question

I'm facing a strange situation with git . I just have edited several lines in a long file but then when I went to commit changes ,I saw that git just highlighted the whole file content with a red color . what is wrong ?

I'm using git's windows GUI

Edit : one thing I remember now is that I added .csproj to the gitignore list in last commit . does this has any effect on this ?

Update : the problem as friends suggested was from line ending . I solved it using this question's answer

Answer 1

The problem was because of line ending .

git config core.autocrlf was set to true . I used solutions mentioned in this 2 posts

Dealing with line endings

Trying to fix line-endings with git filter-branch, but having no luck

and set it as false . and it is solved.