Safari 5.1.8 on Mac OS X 10.6.8.

I have the page: http://www.mediawiki.org/wiki/Talk:Phabricator/Help
I want to add a new subject.
I click the subject line. I write a subject.
Then I click in the text area for my message.

I drag-and-drop some text from the app TextWranger into the text area.

The text area is expected to contain my dragged text. The operation appears to succeed. The drag-and-drop is not put back.

Instead, here the problems start.
If the Safari window was at the front, the text area only contains the first line of the dragged text, all the other lines are missing.
If the Safari window was in background, the text area does not contain the dragged text at all.
Then, the text area has buggy behaviour.
Selecting all with Apple A is buggy.
Moving with Up and Down arrows has inconsistent buggy behaviour.
…

This is a regression.
With the plain old text area, all of that worked well.

It would be nice to correct that.

Thank you.

Nnemo