Don't set the display filter combo's minimum size. This lets us show
more filter expression buttons.
Clear the filter expression toolbar before redrawing it. This gets rid
of a leftover artifact here on macOS.
Change-Id: Iab944e8992caf554e024521df52d0089a4501674
Reviewed-on: https://code.wireshark.org/review/30902
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>