[heft] Fix incremental copy cache file #4950
Merged
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Summary
Fixes bugs in #4943
Details
Ensures that the file copy incremental cache file contains the correct entries.
Ensures that the file copy incremental cache file preserves all entries during a watch mode rebuild, and not only the entries that were changed in the most recent incremental iteration.
How it was tested
Running
heft build-watch
inbuild-tests/heft-file-copy-test
and validating the content of the cache file.Impacted documentation
None