[O] [bug] canonical context not work in 8.3

[Samuel Wales]

(setq org-show-context-detail '((default . canonical))) not work

going from agenda appears to show the first child, and takes
5s or so.

my expectation is that canonical visibility shows no entry
and no children.  first child is non-canonical (i.e. cannot
be reproduced with arrows and tab).

reproduces with my -Q testcase on emacs-version "24.4.1" on
recent maint 8.3.

thanks.