@-mention autocomplete now supports spaces.
The @-mention and slash command autocompletes now only show up if you press the trigger keys, that is "@" and "/". Before, they'd show up if you navigated your cursor after an existing trigger symbol. This was annoying.
You can press Escape to cancel an @-mention or slash command autocomplete, leaving the typed text intact.
Fixed bug causing search results to not support Open in New Tab actions, like middle-click and Ctrl+Click.