view .arcconfig @ 41279:c9e1104e6272

exthelper: drop the addattr() decorator

Yuya pointed out that this goes against the typical advice to not add attributes
to classes[1].  The evolve extension still uses this a handful of times, so
maybe it should be brought back in the future if a general use is found.  But it
isn't nice to have a new helper API that can lead to easy problems.

[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2018-December/126330.html

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