Fix Quickeditor only be shown on one screen on Wayland

Authored by davidre on Thu, Aug 22, 12:05 PM.

Description

Fix Quickeditor only be shown on one screen on Wayland

Summary:
showFullscreen resized it to the size of one screen. show works equally well
but preserves the geometry.

Test Plan: QuickEditor covers all screens on X and Wayland

Reviewers: Spectacle

Tags: Spectacle

Differential Revision: https://phabricator.kde.org/D23346