QmlProfiler: Timeline marker hard to remove

Record or open some QML Trace.

Click into the Timeline's time line (on the top, holding the time stamps) - this creates a marker which can be dragged around.

Trying to remove the marker again is pretty unintuitive and hard to achieve. There is some small rectangle on the lower corner of the triangle holding a minus sign - if you're lucky you remove the marker by hitting the minus - if not you create a new marker.