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Registers a callback that's fired when a shape is erased.

Returns an ID which can be passed to unlisten() to unregister the callback.

this: ui.map.drawingtoolsui.Map.DrawingToolsThe ui.Map.DrawingTools instance.
callbackFunctionThe callback to fire when a shape is erased. The callback is passed three parameters: the removed ee.Geometry, the GeometryLayer from which the geometry was removed, and the ui.Map.DrawingTools widget that the event listener is bound to.