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
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2