Autoresize HTML Labels #247

Following the stashed HtmlLabel story I tried to implement a similar use case. By default it doesn't seem like cells resize correctly according to the content of the label div or do it at the right times when I set autosize to true as follows:

this.graph.setAutoSizeCells(true);
this.graph.autoSizeCellsOnAdd = true;

I figured that the label size might not be calculating correctly so I overrode the getPreferredSizeForCell method:

const oldGetPreferredSizeForCell = this.graph.getPreferredSizeForCell;
      this.graph.getPreferredSizeForCell = function (cell) {
        const result = oldGetPreferredSizeForCell.apply(this, arguments);

        if (result != null && cell._htmlLabel) {
          result.width = Math.max(
            result.width,
            cell._htmlLabel.offsetWidth,
            cell._htmlLabel.getBoundingClientRect().width
          );
          result.height = Math.max(
            result.height,
            cell._htmlLabel.offsetHeight,
            cell._htmlLabel.getBoundingClientRect().height
          );
        }

        return result;
};

With this approach:

1. the labels still don't get sized correctly during initiation (I imagine it's something to do with when convertValueToString gets executed) so I have to manually call updateCellSize on every cell after setting up the graph
2. And the size still seems to get miscalculated on some cells for some reason.

Is there a recommended approach for this use case?