D20351: Increase width of preview of rectangle annotation (dashed rectangle) and set its color same as the color of rectangle that will be created once mouseup event happen.

[Ahmed Bilal]

ahmedbilal added a reviewer: ngraham.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D20351

To: ahmedbilal, #okular, okular-devel, ngraham
Cc: okular-devel, joaonetto, tfella, ngraham, darcyshen, aacid