[ContainmentInterface] Use setSize instead of setWidth/setHeight in createApplet

Authored by broulik on Jan 30 2017, 3:16 PM.

Description

[ContainmentInterface] Use setSize instead of setWidth/setHeight in createApplet

This avoids needless binding updates and expensive layouting.

Differential Revision: https://phabricator.kde.org/D4352

Details