Adding timeout to clear the search field

[alainm23]

Fixed #182

[danirabbit]

This also happens if you use the clear button. So maybe what would be better would be to add the timeout in the search changed handler before we call invalidate_filter?

[danirabbit]

Also don't forget to update metainfo with the bugfix line please :)

[alainm23]

I found a better way to fix it.

[danirabbit]

Clean! love not having to rely on a timeout too. Good job