ACF blocks/overrides coreStyles_ behaviour on paste

[Jakub Ś]

To reproduce:

1. Use below code for editor:

   CKEDITOR.replace( 'editor1', {
   	coreStyles_bold: { element: 'b', overrides: 'strong' },
   	allowedContent: true
   });	
   

2. try to paste HTML containing strong tag (you can paste sample text from other editor, even other browser).

• Result: strong tag is left untouched on paste.
• Expected: strong tag should be transformed to b tag.

While coreStyles_* work well with initial content (strong tags are transformed to b) and when e.g. Bold is pressed (b tag is inserted), they fail when content is pasted.

Please also note if you remove allowedContent: true property all works as expected.

Problem can be reproduced from CKEditor 4.1.