RTL: Indenting list adds extra dir attributes to list items.

[Wiktor Walc]

Caused by [6928].

1. Start with

   <ul dir="rtl">
   	<li>
   		one</li>
   	<li>
   		two</li>
   	<li>
   		three</li>
   	<li>
   		four</li>
   </ul>
   

2. Select two list items in the middle ("two" and "three").
3. Press "Increase Indent"
4. Result:

   <ul dir="rtl">
   	<li>
   		one
   		<ul>
   			<li dir="rtl">
   				two</li>
   			<li dir="rtl">
   				three</li>
   		</ul>
   	</li>
   	<li>
   		four</li>
   </ul>
   

Previously the result was:

<ul dir="rtl">
	<li>
		one
		<ul>
			<li>
				two</li>
			<li>
				three</li>
		</ul>
	</li>
	<li>
		four</li>
</ul>

[Garry Yao]

At least #6861, #8042, #8053 must be re-checked.

[Wiktor Walc]

Unless anything more serious will be found while working with lists, we can correct it in the next release.

The text direction is correct, so let's work on it straight after the release to keep the resulting HTML code as clean as possible.

[Garry Yao]

Looks like wiser to just keep element::getDirection simple.

[Garry Yao]

​http://ckeditor.t/tt/8087/1.html

[Garry Yao]

Fixed with [7219].