If a diary page is opened from outside a wiki buffer the diary frequency
and start of week options are not respected as the wiki number is not
yet set for the local buffer.
Fix this by defaulting the wiki number to 0, which is what is done in
vimwiki#diary#make_note() for the diary_rel_path option that suffers
from the same problem.
Example on how to trigger the problem:
let g:vimwiki_list = [{'path': '~/.vimwiki', 'diary_frequency': 'weekly', 'diary_start_week_day': 'monday'}]
$ vim -c VimwikiMakeDiaryNote
Fixes: a3be479d5a ("Add a diary frequency option (#884)")
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Niklas Söderlund
8f92aaffe4