Add utility function resolveUrl on manager #1993
Merged
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This is needed to be able to resolve file URLs relative to the widget's notebook.
Example: My widget needs to load an image at the path 'img/earth.jpg'. This is implied to be relative to the path of the current notebook (I cannot see a case where this wouldn't be what the user would expect, but I'm sure someone will come along at some point). In classic notebook, this works out of the box, since the url always incorporates the location of the notebook. For jupyter lab, this is not the case. By adding a utility function on the widget manger, we add a frontend-agnostic way of resolving the URL.