The recording extension does not allow you to split pieces further, but CRecord does a less standard extension .
Just to put it this way, but what you do is usually considered bad practice because it ensures that you do not run unit tests on files as they are done. This, of course, does not apply in all environments.
If the reason you leave some incomplete parts is because they are local changes that you always have in place (passwords, paths, etc.), they are a good candidate for the Mercurial Queues patch. Then you can “pull” them out, lock the entire file and then click them again.
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