shellext: Update Icons should recurse into subrepos
When I right-click a repository in Windows Explorer, and select TortoiseHg > Update Icons, it updates the icons only for that repository, not for any subrepos that may be inside that folder. This makes it hard to tell whether any of the subrepos are "dirty".
Please fix the Update Icons feature so that it recursively updates all icons in the folder, whether they are in the top-level repository or a subrepo.
Note: this may be related to: https://bitbucket.org/tortoisehg/thg/issue/1645/incoming-changes-not-displayed-if-recurse