do not copy ui junk to clipboard

[gordonwoodhull]

currently if you select multiple cells and copy them, you'll get the cell commands and part number as well.

it's possible to refine the selection with

    $('body').on('copy', function() {
        var sel = window.getSelection();
       ...
    });

and there are examples of how to add copyright stuff to what's copied

https://www.jitbit.com/alexblog/230-javascript-injecting-extra-info-to-copy-pasted-text/

since Chrome doesn't support Selection.removeRange (and I'm not sure if it is supposed to break the selection into multiple ranges), what we probably need to do is iterate over the cells which are touched by the selection and either add just the content parts to a new selection, or (shudder) create an invisible div, as the folks above are doing.

[gordonwoodhull]

yep clone to offscreen div it is, and removing the .nonselectables