Changelog:
Added new getSize method to DOMUtils it will return the dimensions only of an element.
Added new alert/confirm methods to the tinyMCEPopup class to prevent focus problems and also to shorten method calls.
Added new plugin_preview_inline option to preview plugin to enable/disable native/inline dialogs.
Added new readonly option. If this is set the editor will only display the contents for the user.
Added missing tabindex and accesskey to input elements in the default valid_elements setup.
Updated firebug lite to 1.2, to enable it use the tiny_mce_dev.js?debug=1 on the development package.
Fixed so the preview dialog in the preview plugin uses inline dialogs/popups.
Fixed so CDATA sections remains intact through the serialization process of the DOM tree.
Fixed various issues with the getAttrib command. It will now return more correct values.
Fixed bug where the embed element wasn't properly parsed in the media plugin it now supports 3 formats.
Fixed bug where the noshade attribute was serialized incorrectly on IE.
Fixed bug where editing an existing link element didn't force it relative.
Fixed bug where image link creation fails on Safari if the image is aligned.
Fixed bug where it was possible to scroll the fullscreen mode in Opera 9.50.
Fixed bug where removal of center image alignment would fail. Patch contributed by Andrew Ozz.
Fixed bug where inlinedialogs didn't work properly if the doctype was incorrect in IE.
Fixed bug where cross domain loading didn't work correctly in Opera 9.50.
Fixed bug where breaking huge text blocks with return/enter key would scroll to end of block.
Fixed bug where replace button kept inserting the replacement text even if there is no more matches.
Fixed bug with fullpage plugin where value wasn't set correctly. Patch contributed by Pascal Chantelois.
Fixed bug where the dom utils setAttrib method call could produce an exception if the input was null/false.
Fixed bug where pressing backspace would sometimes remove one extra character in Gecko browsers.
Fixed bug where the native confirm/alert boxes would move focus to parent document if fired in dialogs.
Fixed bug where Opera 9.50 was telling you that the selection is collapsed even when it isn't.
Fixed bug where mceInsertContent would break up existing elements in Opera and Gecko.
Fixed bug where TinyMCE fails to detect some keyboard combos on Mac, contributed by MattyRob.
Fixed bug where replace all didn't move the caret to beginning of text before searching.
Fixed bug where the oninit callback wasn't executed correctly when the strict_loading_mode option was used, thanks goes to Nicholas Oxhoej.
Fixed bug where a access denied exception was thrown if some other script specified document.domain before loading TinyMCE.
Fixed so setting language to empty string will skip language loading if translations are made by some backend.
Fixed so dialog_type is automatically modal if you use the inlinepopups plugin use dialog_type : "window" to re-enable the old behavior.