Gives immediate focus to the search entry control after pressing the shortcut to show it
Summary:
when showing the filter panel, give it focus immediately
clean up the logic behind the filter bar expanded and collapsed states
CCBUG: 398718
Test Plan: pressing the shortcut gives focus
Reviewers: astippich, januz, ognarb
Reviewed By: astippich
Tags: Elisa
Differential Revision: https://phabricator.kde.org/D15607