Inconsistent behavior when applying paragraph format

[Wiktor Walc]

When "Formatted" paragraph format is used, the behavior of the editor is different that ussual.

Steps to reproduce

Scenario 1

• starting with a new blank page
• select "Heading 2" format
• switch to source mode
• result: no HTML code, source is empty
• switch to wysiwyg mode
• result: "Heading 2" is still selected

Scenario 2

• starting with a new blank page
• select "Formatted" fomat
• switch to source mode
• result: HTML source

  <pre>
  </pre>
  <p>
  	&nbsp;</p>
  

Problems:

1. HTML source is not empty
2. There is an empty paragraph at the bottom

[Garry Yao]

Fixed with [6142].

[Garry Yao]

As after #5402, we're able to exit from <pre> with SHIFT-ENTER.

[Frederico Caldeira Knabben]

I've reverted [6142] with [6181] because the SHIFT+ENTER strategy to move out our <pre> is counter-intuitive.

A better solution need to be found. Probably aligning the <pre> behavior to <p> is the best we should do, just like proposed at ticket:5402#comment:11.

[Garry Yao]

Depends on #6841.

[Wiktor Walc]

Considering that #6841 is targeted to 3.6, moving this one there.

[Garry Yao]

Besides the keystroke change, the patch propose of using <br> consistently in all browsers inside pre-formatted block which leads to following benefits:

1. Reduce selection bug introduced by using text-only breaks;
2. Easier range position management after line break insertion.

[Garry Yao]

Update patch after [6682], line break fixing part of previous patch moved to #7170.

[Frederico Caldeira Knabben]

I'm still having an empty <pre> in the source view (reported problem "1").

[Garry Yao]

Fixed with [6698] on trunk.