Incorrect remove preformatted block

[Garry Yao]

1. Load with the following content and selection:

   <p>
   	pargraph[ one</p>
   <p>
   	pargraph ]two</p>
   
   

2. Open format combo and click on preformatted block;
3. Click again to remove formatted block;

• Actual Result: Two paragraphs merged into one.
• Expected Result: The original content is reverted.

[Sa'ar Zac Elias]

Starting [6344].

[Wiktor Walc]

In enter mode = BR a div element is left in the source, when preformatted element is removed (if it has no extra attributes it makes no sense to leave it there).

[Sa'ar Zac Elias]

Use the following:

<p>
	Pa[ra 1</p>
<p>
	&nbsp;</p>
<p>
	Pa]ra 2</p>

Apply preformatted style and remove it.
Expected: Original content is reverted.
Actual:

<p>
	Para 1</p>
<p>
	Para 2</p>

[Garry Yao]

@Saar, the cited case is not a regression and opens #7065.

[Sa'ar Zac Elias]

(For reference, the very same can be reproduced when applying "normal" instead of removing the preformatted style).

[Garry Yao]

Fixed with [6370].