A small Git bug

I have three branches: master, prerelease, and devel.

Suppose now we are in master.

I often run the following command (in fact it is an alias, to save typing):

git push && git checkout prerelease && git merge master && git push && git checkout devel && git merge prerelease && git push && git checkout master

There is a small problem: After running this command my text editor proposes me to reload changed files.

So, it seems that the above command marks some files as changed. It is wrong, because it is inconvenient a little to reload a file or two every time after I submit the changes.