[IE] Preformatted edit problem

[damo]

This issue may be related to #3948.

1. Add some preformatted content like so:

<pre>Test line 1

Test line 2</pre>

2. Place cursor at end of line 2 and hit ENTER.

Notice that a space is added instead of a new line.

3. Revert to content as at 1.
   
4. Place cursor at end of line 1 and hit ENTER.

Result:

<pre>Test line
 1

Test line 2</pre>

The actual result should be a new line, the space and "1" should not be on the new line

[garry.yao]

There were actually two separated problem described in the description:

1. The line break display as a space: This's been a browser rendering bug from IE, we've spotted this wrong behavior on other blocks as well, even when enterKey is creating <br>. We're hardly possible to resolve this issue at the moment;
2. The line break is not created at the right position: This should be fixed by the ticket.

[garry.yao]

The culprit is inside the IE selection system where it report wrong offset position with the following text selection:

line1^\r\nline2

Based no this fault, the range system is incorrectly figure out it as:

line^1\r\nline2

The solution is just about normalizing the CRLF for IE.

[garry.yao]

Replying to garry.yao:

There were actually two separated problem described in the description:

1. The line break display as a space: This's been a browser rendering bug from IE, we've spotted this wrong behavior on other blocks as well, even when enterKey is creating <br>. We're hardly possible to resolve this issue at the moment;

Thing changed, I've just find a workaround for this issue, a new patch will come soon.

[fredck]

Replying to garry.yao:

1. The line break display as a space: This's been a browser rendering bug from IE, we've spotted this wrong behavior on other blocks as well, even when enterKey is creating <br>. We're hardly possible to resolve this issue at the moment;

I think we could find a way to fix it, as V2 works well in this sense.

[garry.yao]

Fred's pointing to a experienced way of fixing the IE rendering issue, it should be used rarely but a treatment for this case.

[garry.yao]

Fixed with [3898]. Click here for more info about our SVN system.