Quicklinks shortcut stuff
Reduce surprise in quicksearch.

When searching for a term that returns a unique result, where that result
is in the current list, preserve the current list *only* if the current
list is interesting.

Probably an even better answer is to always make a new list but I do
remember why the current behavior is useful.
Bare keyword searches, such as 'ti:', match everything.

And check for empty strings sometimes.

And correct a regex error.
Support searches like KEYWORD:(WORD1 OR WORD2).

Same as KEYWORD:WORD1 OR KEYWORD:WORD2.