This was confusing because there are other elements named
e.g. "#buddy-list-users-matching-view-container", which are
distinct from "#buddy-list-users-matching-view", and the
elements with the latter id should not be named with container
in the variable name.
User circles indicating their presence are now synced across
all the places they appear, except for:
- navbar_personal_menu_popover - since the status
there will never change.
- typeahead_ist_item - because it is short-lived.
Fixes#30536
Note: This involves adding presence info of unknown users to the
presence data.
With some small tweaks, we can just add the info to the presence data
structures, just making sure the buddy list correctly skips those
entries and that we redraw the user in the case where the user creation
event arrives after the presence polling loop.
