Add a convenience function for the displayfilter combobox
and clean up some code. On Linux, the AltModifier does not work
as it is being used by xDMs to move the window around. Setting
it to Shift.
Change-Id: I1ee9638c1cf37f40dc21f19c4e0860adc4629d4e
Reviewed-on: https://code.wireshark.org/review/22529
Petri-Dish: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>
Reviewed-by: Roland Knall <rknall@gmail.com>
Roland Knall