view .arcconfig @ 41401:4a33a6bf2b52

diffstat: support filenames with whitespaces on renames

This is a follow-up patch to D5628. `line.split()` cannot get filenames with
whitespaces as mentioned by @yuja. This patch replaces `split()` method with
`slice`. Corresponding tests were also added.

Differential Revision: https://phab.mercurial-scm.org/D5709

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