D9980: Do not reset the size of window once we move it to an edge

[Jan Grulich]

jgrulich added a subscriber: plasma-devel.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D9980

To: jgrulich, graesslin
Cc: plasma-devel, kwin, #kwin, iodelay, bwowk, ZrenBot, progwolff, lesliezhai, 
ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart