We should try to detect a (likely graphical) mergetool, if present and use by default. If no graphical merge tool, we should consider installing editmerge from contrib.
I thought the system hgrc had defaults for common ones and would use them. I know for MozillaBuild I shipped Kdiff3 and it seemed to get used automatically.
I think the Windows install magically has mergetool magic. I think at least part of the problem here is distro installs may not be doing it right. It's easy enough to check for it being missing.
Component: mach → Mercurial: configwizard
Product: Core → Developer Services
Version: unspecified → Trunk
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