Duplicate "src" attribute in image input type element

[wwalc]

Create image button and you'll see:

<input alt="" src="http://a.cksource.com/a/1/gfx/logo_ck_editor.png" src="http://a.cksource.com/a/1/gfx/logo_ck_editor.png" type="image" />

(the "src" attribute is repeated).

[garry.yao]

The 'name' and 'src' protecting logic is currently causing a lot of code DUP, adding a new rule for this purpose is preferred, e.g.

	var defaultHtmlAttirubteRules =
	{
		elements : {
			$ : function( element )
			{
				var attribs = element.attribs;
				if ( attribs && attribs._cke_saved_name )
					delete attribs.name;
				if ( attribs && attribs._cke_saved_href )
					delete attribs.href;
			}
		}
	};

[fredck]

Fixed with [3778].