Preserve file order of messages during successive daemon runs #13780
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This fixes an annoyance where the messages got reshuffled between daemon runs.
Also if there are messages from files that didn't generate messages during the previous run, move them towards the end to make them more visible.
The implementation is a bit messy since we only have a list of formatted lines where it's most natural to sort the messages, but individual messages can be split across multiple lines.
Fix #13141.