style attribute needs protection

[Karen Ananiev]

Every browser changes the value of the style attrubute in the way it need. I think that this attribute should be protected like src/href attributes. It will fix some already reported issues (eg. #460) and the following bug in FF:

If style attribute contains unsupported css properties, FF removes this properties after switching to wysiwyg mode. For example:

Insert this code in source mode, switch to wysiwyg mode and back to source mode.

<p style="zoom:1">This is some <strong>sample text</strong>. You are using <a href="http://www.fckeditor.net/">FCKeditor</a>.</p>

Please, protect style attribute via _fck_style or anything.

[Artur Formella]

Confirmed, but I'm not sure we are able to fix it.

[Wiktor Walc]

Duplicate of #5528 (the second ticket contains more information, so closing this one).