libimaildir: gather updates after SEARCH finishes
libimaildir: gather updates after SEARCH finishes

This makes SEARCH more like other commands; the SEARCH that is issued by
the client only applies to what is in the view when the SEARCH begins
processing, and doesn't include things newly added to the view during
the SEARCH.

Splintermail/splintermail-client,Splintermail/splintermail-client,Splintermail/splintermail-client