unshelve: unify logic around creating an unshelve changeset
This is a follow-up patch to 5162753c4c14 on addressing reviews
on the commit. This unifies the logic around creating an unshelve
changeset.
Differential Revision: https://phab.mercurial-scm.org/D6683
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2