Return early if close button accepts input event
Summary:
Otherwise we close the effect whenever the close is pressed which is a
behavioural change.
That in turn leads to bigger bugs
BUG: 415155
Test Plan:
Ran effect
Clicked on the "Whitespace" of the dash
Clicked on the close
Now matches desktopgrid code
Reviewers: KWin, zzag, ngraham
Reviewed By: KWin, zzag, ngraham
Subscribers: ngraham, zzag, kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D27333