In current master, it looks like save local no longer proposes the name of the first mesh as the filename. Back to typing in a name. However, my plugin was also trying to use the following to propose an initial file name, but it no longer works. Did the property move? If so, where to?
for n in BreadthFirstIterator(node): if n.getMeshData(): fileName = n.getName() if fileName: break
where node is passed into OutputDevice.requestWrite