This avoid slow loading for some weird slow spaced out input stream.
(one input every 250ms).
Not sure what use-case this fixes.
This fix does cause a noticable slow-down on very large lists.
Issue: #1680
* Don´t refilter on each key-press.
* Make sure refiltering is not completely starved.
* Force refilter before accepting entry
* Go into 'timeout' refilter mode only after certain # elements.
* [DMenu] threading with getdelim to speed up reading.
* [View] Remove debug output.
* [dmenu] Fix pre-read.
* [DMenu] Make sure that async mode cannot block
* Remove mutex for IPC via pipes.
* [Dmenu] Small cleanup.
* [Scrollbar] Fix scrollbar overflowing on big lists.
* Fix stack overflow by creating to many filter jobs.
* [Doc] Add new option to manpage
