view .hgtags @ 15337:cf5f9df6406b stable

windows: recompute flags when committing a merge (issue1802)

Before this patch, Windows always did the wrong thing with exec bits
when committing a merge: consult the flags in first parent.

Now we manually recompute the result of merging flags at commit time,
which almost always does the right thing (except when there are
conflicts between symlink and exec flags).

To do this, we:

- pull flag synthesis out into its own function
- delay building this function unless it's needed
- add a merge case that compares flags in local and other against the ancestor

This has been tested in multiple ways on Linux:

- running the whole test suite with both old and new code in place,
  checking for differences in each flags() result
- running the whole test suite while comparing real on-disk flags
  against synthetic ones for merges
- test-issue1802 (from Martin Geisler) which disables exec bit
  checking on Unix

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