[Orgmode] bug report: global tags completion in agenda

[Maxim Loginov]

hi all

from info:
`C-c a m'
     Create a global list of tag matches from all agenda files.

I expect that global list of tags to be created and prompted for
completion.  but when try to complete tags in prompt "Match:" only
tags from org-file, where tags were recently edited in any way, are
prompted, not a global list from all agenda-files as expected.  the
most wondering thing is that tag list is prompted not even from last
edited file, but from file where tags were somehow touched (edited,
realigned or similar). if you simply edit file without touching tags,
the tag set is not changed. basically, if you just run emacs without
any tag editing/aligning/whatever, you'll see empty completion list.

I'm using emacs-22.1 and org-mode-4.79

best
Maxim Loginov