[Issue 14790] coverage merge should detect changed source code

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14790

--- Comment #1 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> ---
Why not just compare the modification time of the source file with that of the
existing coverage file? That would be simpler, and allow avoiding changing the
format of the coverage file.

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