Track all changes in a notebook

Hi guys,

for my add on project I need to track all the changes in a notebook and, depending on the changes, performing some actions.

I managed to track text changes in the active cell with the on(“change”) method of codemirror:

notebook.activeCellChanged.connect(() => {
    (<CodeMirrorEditor>currentCell.editor).editor.on("change", changeHandler);

in changeHandler I’m able to analyze the change object.

Trying to handle the changes in the model in general (cells added/removed, cell type changed, cell executed, text in cell changed), I’ve found the modelContentChanged property of the notebook object, which is fired exactly every time I need it. My problem is that I can’t find how to know in what the change consists.
For example I can save the number of cells in a variable and after the event is fired I can check if the number is still the same or not, but in that case I don’t know how to find out which cell has been removed or where it has been inserted.

I hope I’ve explained the problem clear enough,



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