Apparently 'Bug 1114669 - Removing an IDL file requires a CLOBBER touch' handles the case when removing an IDL file, but not when you move and IDL from one place into another.
(In reply to Christoph Kerschbaumer [:ckerschb] from comment #1) > Bug 1134243 highlights the issue. Should have been bug 1109910, presumably :)
This was different bustage not related to the IDL changes.
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