4.0.x Autogrow in IE8/9 causes cursor to 'jump'

[Steve Calvert]

When the autogrow plugin is enabled we're noticing an issue in IE8/9.

Steps to reproduce:

1. Ensure autogrow plugin is enabled.
2. Place cursor in editor and hit enter to make the editor grow

Once the cursor reaches the end of the available editor, every time the enter key is pressed the cursor moves to the next line, then immediately jumps back to its position in the prior line.

I know this isn't a ton to go on, and we also found it difficult to reproduce under certain circumstances. We did notice that this was an issue when IE went into compatibility mode, such as with an intranet site.

[Jakub Ś]

Problem can be reproduce in IE7-10 from CKEditor 4.0 (works fine on 4.0 beta)

To reproduce:

1. Set compatibility mode in IE
2. Open autogrow sample
3. Start pressing enter key

Please also see attached screen cast showing this problem.