applets/taskmanager: reset animating property on mouse enter
TaskList Grid move during a SequentialAnimation sets an later removes "animating" property. Sometimes (e.g. session restore) this animation fails to complete and then "animating" property remains true. This prevents drag'n'drop with mouse, as MouseHandler onPositionChanged skips everything if "animating" property is set.
BUG: 465377 FIXED-IN: 6.0
Edited by Nate Graham