IE: pasted text wrapped in double strong tags

[Jakub Ś]

1. Start with empty editor
2. Type some text then select it with a mouse and apply bold formatting
3. Copy text with CRTL+C
4. Text is still selected so delete it using BACKSPACE. Press backspace more than once to clean all the remainings
5. Paste the text using CRTL+V
6. Switch to source. You will see that text is wrapped in two strong tags.

Issue is reproducible in IE6, IE7 and IE8 from CKEditor 3.0

NOTE: If you put cursor inside selected text you will see that path is showing “body strong p strong”. At first I thought that this was another error but this is what IE actually produces (check it with DOM inspector).
When you switch to source mode, the code is rearranged in to “body p strong strong”.

[Jakub Ś]

The same TC produces different error in Webkit and FF4 - #8011

[Garry Yao]

DUP of #5756.