Resets cursor rectangles so the cursor becomes an I-beam over text cells.
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This method resets the cursor rectangles by sending resetCursorRect(_:in:) to each cell in the receiver. Any cell that has a cursor rectangle to set up should then send addCursorRect(_:cursor:) back to the receiver.
func addCursorRect(NSRect, cursor: NSCursor)
Establishes the cursor to be used when the mouse pointer lies within a specified region.
func resetCursorRect(NSRect, in: NSView)
Sets the receiver to show the I-beam cursor while it tracks the mouse.