$ git pause <file>

.gitconfig

# git pause <file>
# Stops tracking <file> if already in the repo

# Have SomeHeader.h that changes on every developers machine ?
# Want it in the repo, got still want the magic of .gitignore on the file ? 

# easy
# git pause SomeHeader.h

# making changes to SomeHeader.h wont be staged, wont show in diff or status. perfect!

# Here's how the alias section in your .gitconfig should look like
[alias]
    pause = update-index --assume-unchanged
    resume = update-index --no-assume-unchanged

    # love these as well!
    st = status -s
    lg = log --oneline -5

# to undo ( when you acutally want to start committing it again ) 
# git resume SomeHeader.h

#Note: you'll still be able to merge, but mostly will have to pause/stash/revert changes