Fix disappearing content on iFrame when outer text in modify. Use load event.
Support for custom document.domain in IE.
Fix IE9 MathJax crash on undo.
Add comments.
Add data-cke-survive to keep element event if it is empty.
Fix FF & IE9 problem with copy & paste. Iframe is created in widget init.
Check if 'data-cke-survive' equals 'true'.
Change regex, which remove iframe, to be non greedy.
Change regexp, remove only iframes inside mathjax spans.
Add loading indicator.
Check only if data-cke-survive attribute exists, not the value.
Replace data-cke-survive='true' with data-cke-survive=1.
Move loader.gif from icons to images.
Code style.
Changelog entry.
Merge branch 't/10937' into major