Open FileBrowser from other extensions with arguments

The FileBrowser can be opened from other extensions via:

vispa.callbacks.emit("openFileBrowser", workspaceId, args);

But in contrast to the FileSelector which accepts args containing e.g. an initial path,
the FileBrowser does not use the passed args. At least the configuration of
an initial path would be helpful.

(from redmine: issue id 2165, created on 2015-03-09 by root, closed on 2015-04-27)