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	argument instead of implementing it ourselves.
	(rectangle-coerce-tab): No longer used; deleted.

	* rect.el (open-rectangle): Leave point at the upper corner of the
	rectangle just opened, in imitation of open-line.  Fix doc typo.
	(open-rectangle-line): Use skip-chars-backward's LIM argument to
	leave spaces before the line segment's beginning undisturbed.

	* rect.el: Provide 'rect.