view .hgtags @ 27513:707cdf2c3700 stable

mq: use fallback patch name if no alpha-numeric in summary line (issue5025)

Before this patch, "hg qimport -r REV" fails, if the summary line of
description of REV doesn't contain any alpha-numeric bytes.

In this case, all bytes in the summary line 'title' are dropped from
'namebase' by the code path below.

     namebase = re.sub('[\s\W_]+', '_', title.lower()).strip('_')

'makepatchname()' immediately returns this empty string as valid patch
name, because patch name conflicting against empty string never
exists.

Then, "hg qimport -r REV" is aborted at creation of patch file with
empty filename.

This situation isn't so rare. For example, ordinary texts in Japanese
often consist of non alpha-numeric bytes in UTF-8.

This patch makes 'makepatchname()' use fallback patch name if the
summary line of imported revision doesn't contain any alpha-numeric
bytes.

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