ng a convoluted, yet elegant overlaying strategy.
				(I prototyped this <a target="_blank" href="https://jsfiddle.net/1j01/wnac09u3/">here</a>
				and <a target="_blank" href="https://jsfiddle.net/1j01/qkvfjn1r/">here</a> if you're interested.)
			</p>
			<p>
				With the fill-only option selected, the Polygon tool now previews with inverted lines, like MS Paint
				does.
				(When you finish the polygon, the boundary of the shape matches the preview exactly,
				because it actually <em>does</em> draw a st