Asymmetrical enlarge.

[Piotr Jasiun]

After call range.enlange there should be both opening and closing tags in range or none of them, but tests created for #10778 shown some incorrect situations:

	// <div>x<p>[foo] <b></b></p>x</div> ->
	// <div>x[<p>foo] <b></b></p>x</div>

	//Should be:
	// <div>x<p>[foo] <b></b></p>x</div>

Or:

	// <div>x<p>foo <i><b>[bar]</b></i> </p>x</div> ->
	// <div>x<p>foo [<i><b>bar</b></i> </p>]x</div>

	//Should be:
	// <div>x<p>foo [<i><b>bar</b></i> ]</p>x</div>

Note that changes introduced in #10778 does not cause this behavior, the bug existed before. To see more incorrect situations go to enlarge.html tests.

[Olek Nowodziński]

cc