D21249: Test current filter before setting a new one

[Jan-Marek Glogowski]

jglogowski added a reviewer: Frameworks.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D21249

To: jglogowski, #frameworks
Cc: michaelweghorn, kde-frameworks-devel, michaelh, ngraham, bruns