Henré Botha 527fd17ffc Don't fetch suggestions after copy-earlier-word
Like {up,down}-line-or-beginning-search, this widget relies on
`$LASTWIDGET` being set to function correctly on subsequent invocations.

When asynchronous suggestions are enabled, and the widget triggers a
suggestion to be fetched, `autosuggest-suggest` will be called and
$LASTWIDGET will be set to it.
..
integrations Refactor async mode to no longer use zpty
options Allow disabling of automatic widget re-binding
strategies Revert async process substitution & completion strategy
widgets Enabling suggestions should not fetch a suggestion if buffer is empty
async_spec.rb Don't fetch suggestions after copy-earlier-word
kill_ring_spec.rb Don't break kill ring rotation
multi_line_spec.rb Lots of async changes
spec_helper.rb Don't overwrite config with default values
terminal_session.rb Revert async process substitution & completion strategy