Respect the working set of Eclipse when building Gradle Model

When Building the model that displays in the Gradle Tasks display, the Eclipse Working Set is not respected. The working set is a kind of filter that displays a subset of projects in the Eclipse Workspace. It would be nice to have, as an option at least, the ability to restrict the projects that Gradle builds for its model to those in the currently active working set. In a large workspace the time to build the model is not negligible, and it could be cut down considerably by limiting this activity to projects in the working set. Another benefit would be to remove clutter in the Gradle Tasks window, just as the Working Set reduces clutter in the Project Explorer window.

There is an open feature request for that. In case someone is interested, we would happily accept a contribution for that.