feat(completion): wire query completion into the main window

Adds the complete_query action, whose registration the assertion in
registerActions() has been demanding since keymap gained the name: a
known action nothing implements would have been a silently dead binding.

Also lands the QueryCompleter half of the manual trigger, which the
keymap commit left behind: triggerCompletion() and the focus-in filter
gated on completion_on_focus.

Tags refresh at startup, after a sync, and after a mutation introduces a
tag not already known, since that is the tag most likely to be typed
again. onAllTagsReady deliberately drops the generation the signal
carries: a tag list is not an ordered query result, so a later one is
always at least as good as an earlier one and discarding on staleness
could only throw away a good list.

0 files changed, 0 insertions, 0 deletions