Delete Region

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JASS:
native RemoveRegion takes region whichRegion returns nothing
This native takes the region you want to destroy as a parameter and will have released the resources it used by the time it returns. Remember that handleID recycling only occurs once the pointer count to a handleID reaches 0 and the object the handleID was bound to no longer exists.

Be warned that "GUI Regions" are not regions but infact rects. Use the below instead in this case.
JASS:
native RemoveRect takes rect whichRect returns nothing
This native takes the rect you want to destroy as a parameter and will have released the resources it used by the time it returns.

The difference between a rect and a region is...
A rect represents a square area of playfield aligned with the axis of the playfield and must always contain some area of the playfield.
A region can consist of any number of rects and playfield "cells" and need not have any actual playfield area mapped to it.
 
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