Are git branches isolated from master?

Question

Assume this scenario:

1 - I checkout master, and do a git pull to get the latest

2 - I checkout my own new branch from master git checkout -b my-branch

3 - Few days pass, I stash my branch changes, checkout master and do git pull again

4 - I checkout back to my own branch git checkout my-branch

Now the new changes in master (from step 3) are also present in my branch, how is that possible? I thought a branch is an isolated branch from master.

Answer 1

You're doing something wrong. The new changes from master can't appear on your local branch. It breaks the whole git idea.

Just to be sure tested it on new folder with file. I commited it as "1st" commit, then perfomed checkout to new branch my-branch , then stashed some file edits on it and checkouted back to master . Then I created "2nd" commit and checkouted to my-branch and, of course, everything is the same as in "1st" commit because I branched from it and create my-branch ref on "1st" commit.