BIDI: When item of a is set to RTL, bullet is not visible

[Krzysztof Studnik]

Different Behaviour of #6692 under IE8
Under IE8, In source mode, paste:

<ol>
	<li>
		line 1</li>
	<li>
		line 2</li>
	<li>
		line 3</li>
</ol>

back in WYSIWYG, select one item and press RTL

Expected result
selected list item is moved to right, bullet is set to the right edge of edit area.

Actual result: Code looks OK

<ol>
	<li>
		line 1</li>
	<li dir="rtl">
		line 2</li>
	<li>
		line 3</li>
</ol>

But in WYSIWYG, the the RTL item has no bullet (attached screen)

[Garry Yao]

DUP of #6249.