you should be branching for every bugfix, then when you have fixed the bug and the code passes all known tests + the one for the bug, you should merge it back s

you should be branching for every bugfix, then when you have fixed the bug and the code passes all known tests + the one for the bug, you should merge it back squashing the branch commit history with a single merge (where you add your own comments instead of just using 'merged in blah blah'.