[Bug 3879] New: hg patch on Windows removes newlines

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=3879

          Priority: normal
            Bug ID: 3879
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: hg patch on Windows removes newlines
          Severity: bug
    Classification: Unclassified
                OS: Windows
          Reporter: jaraco at jaraco.com
          Hardware: PC
            Status: UNCONFIRMED
           Version: unspecified
         Component: Mercurial
           Product: Mercurial

Using hg 2.5.2 as bundled with TortoiseHg 2.7.1 64-bit, I apply a simple patch
using the 'hg patch' command.

Both the source file and the patch file use Unix LF newlines, but the resulting
commit (or outstanding changes if --no-commit is used) are missing all blank
lines. That is, patch has caused more changes than were specified in the patch
file, replacing all instances of '\n\n' with '\n', even in parts of the file
that weren't even referenced by the patch.

I was able to work around the problem by performing the same patch operation
using the exact same files mounted in a Vagrant VM using Ubuntu and hg 2.5.2,
so the problem seems to be isolated to Windows.

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