How to push changes from a squash merge back into source brach
===

I've got a branch I want to merge into another via a squash commit. In some cases these new files have leading or trailing spaces that are not needed. If I remove the extra spaces during the squash merge how do I push those changes into the original branch?

Currently I am applying the changes twice. Once when I squash merge into a testing branch. And again when I squash merge the original branch into master.