inspector change thingy

 onCellChange: function(eventName, cell, change, opt) {

        opt = opt || {};

        // Do not react on changes that happened inside this inspector. This would
        // cause a re-render of the same inspector triggered by an input change in this inspector.
        if (opt.inspector == this.cid) return;

        // Note that special care is taken for all the transformation attribute changes
        // (`position`, `size` and `angle`). See below for details.
        
        switch (eventName) {
            
          case 'remove':
            // Make sure the element inspector gets removed when the cell is removed from the graph.
            // Otherwise, a zombie cell could possibly be updated.
            this.remove();
            break;
          case 'change:position':
            // Make a special case for `position` as this one is performance critical.
            // There is no need to rerender the whole inspector but only update the position input.
            this.updateInputPosition();
            break;
          case 'change:size':
            // Make a special case also for the `size` attribute for the same reasons as for `position`.
            this.updateInputSize();
            break;
          case 'change:angle':
            // Make a special case also for the `angle` attribute for the same reasons as for `position`.
            this.updateInputAngle();
            break;
          case 'change:source':
          case 'change:target':
          case 'change:vertices':
            // Make a special case also for the 'source' and 'target' of a link for the same reasons
            // as for 'position'. We don't expect source or target to be configurable.
            // That's why we do nothing here.
            break;
        default:
            // Re-render only on specific attributes changes. These are all events that starts with `'change:'`.
            // Otherwise, the re-render would be called unnecessarily (consider generic `'change'` event, `'bach:start'`, ...).
            var changeAttributeEvent = 'change:';
            if (eventName.slice(0, changeAttributeEvent.length) === changeAttributeEvent) {
                
                this.render();
            }
            break;
        }
    },