textarea/textfield contents are editable

[Garry Yao]

On 3.3.x branch the following bug is noticed.

Environment

Firefox, IE

Reproducing Procedures

1. Open any of the sample page and make the following selection:

   <textarea name="editable" id="" cols="30" rows="10">^some text</textarea>
   

   • Actual Result: The textarea become editable in effects.
2. Press 'Enter' key inside the editable textarea;
   • Actual Result: New paragraph is created before the textarea;
3. Put the cursor among the text and press 'Enter' key again;
   • Actual Result: In IE, the textarea is splitted into two.

[Garry Yao]

This's a regression brought by #3593.

[Garry Yao]

This now become part of #5737.

[Sa'ar Zac Elias]

It has been fixed by #5737.
#5519 is a DUP.