undo / redo and switching to standard mode CKE - empty spans bookmark

[santaclaus21]

TextSelection & Codemirror. Go to source, select some text, go back to standard edit then "undo" is active. Go back to source and we can find empty span like id="cke_bm_291C".

w8tcha/CKEditor-CodeMirror-Plugin#43

Long time I thought it's problem with Codemirror, now I see I was wrong. Without text selection plugin everything is working.

Last build (git) + last codemirror (git) + CKE 4.4.1.

and example: http://youtu.be/fiu3V3VEq14

[w8tcha]

The problem is that the editor thinks the content has changed because the bookmark was "temporally" added and then enables the undo function.

Fixed now

[santaclaus21]

Working great! ... But, after go back to standard editor (from source) undo actions are lost.