IE9, BIDI - cannot switch between paragraphs via kursor keys

[Krzysztof Studnik]

IE9, document mode ie8 standards

• in Source mode, paste following code

  <p dir="rtl">
          1</p>
  <p dir="rtl">
          2</p>
  <p dir="rtl">
          3</p>
  <p dir="rtl">
          4</p>
  <p dir="rtl">
          5</p>
  

• switch to WYSIWYG
• select first paragraph
• using cursor keys, try to jump to next line.

Expected: Cursor is set to next line

Actual: Each RTL paragraph is treated as another "text area"

[Alfonso Martínez de Lizarrondo]

This problem also exists in IE8 and it's due to #5918 although it's possible to finally using the cursor keys after some tries using Esc and Tab keys.