Nested list in RTL is incorrectly presented

[garry.yao]

Nested list like the following looks wrong in editor as there's no desired margin on the right side to differs from the 1st level list.

<ul>
	<li>
		List item 1 (LTR)
		<ul>
			<li dir="rtl">
				List item 2 (RTL)</li>
		</ul>
	</li>
	<li>
		List item 3 (LTR)</li>
</ul>

[garry.yao]

The problem is originally been reported ​here.

[fredck]

This issue can be easily worked around by CSS. My opinion is that we should add the necessary rules to the contents.css file, without bloating the editor code.

[garry.yao]

Supposed to be fixed by #6249.

[tobiasz.cudnik]

It's not fixed by #6249.

[tobiasz.cudnik]

Actually, after second check it indeed is fixed by #6249.