After autoupdate remote branches;

• check if a fast forward merge would not work, then:
• indicate that with a new "warning" icon.

That means for example, if someone pushed a change into a file, working at the sames lines, a fast-forward merge would not work. So an optical indicator would tell me that manual merge will be required if I push to same branch.

Would be good to let define which branches it should test, like:
[x] current branch
[x] main branches (defineable, like master,main,dev, ...)