Arnt Gulbrandsen
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Features git will never have, part 1

When you open a file for writing in perforce, it checks whether anyone else is working on the same file, and tells you who, if someone is.

This is a fine feature. It warns you if there was a misunderstanding and someone else is already doing what you're about to start doing, and it warns you if someone else has forgotten to commit a change. The price for that is that the perforce server has to know who has the file open for writing, and that when you see that message x is also editing y, you have to talk to x about whether your work conflicts.

Git has nothing like a perforce server, so no place to check for such approaching conflicts.