autoBind re-binds already bound functions

[robagar]

Bug

It seems that each time a widget is rendered and autoBind is called, it binds all functions including those that have already been bound.

Package Version: 6.0.0

[robagar]

Reopening because it does seem to be real - in WidgetBase.set_properties is this code

    if (this._initialProperties) {
      autoBind(this);
    }

    if (this._initialProperties === false || registeredDiffPropertyNames.length !== 0) {
      ...
    } else {
      this._initialProperties = false;
    }

so if registeredDiffPropertyNames is not empty _initialProperties is never set to false