+>> >>> The reason that transientdir needs to be absolute is that it's
+>> >>> added as an underlay.
+>> >>>
+>> >>> We could avoid using `Cwd` by taking the extra commit from either
+>> >>> `smcv/transient-relative` or `smcv/transient-relative-api`;
+>> >>> your choice. I'd personally go for the latter.
+>> >>>
+>> >>> According to git grep, [[plugins/po]] already wants to look at
+>> >>> the underlaydirs in its checkconfig hook, so I don't think
+>> >>> delaying calculation of the underlaydir is viable. (I also noticed
+>> >>> a bug,
+>> >>> [[bugs/po:_might_not_add_translated_versions_of_all_underlays]].)
+>> >>>
+>> >>> `underlaydirs` certainly needs to have been calculated by the
+>> >>> time `refresh` hooks finish, so `find_src_files` can use it. --s
+