redesign UI for hiding/showing classes #41
Description
In the current implementation, there is a feature that shows/hides specific classes. The UI of this feature is a list of class names with check boxes, which are not nice. Consider better UI and implement that.
One idea is:
- for hiding, right-click a node in the graph, select a menu item "hide".
- for showing, provide a button "Hidden classes" which shows a dialog that lists a hidden class names. The user should be able to deselect some of the hidden classes.