#377 Debugger - don't collapse expanded variables on step

[Peter Harris]

Currently the debugger collapses expanded items in the variables pane (objects, lists, etc) when you step or run to breakpoint. It would be good if the debugger remembered what was expanded and kept it expanded when it refreshed after a step (unless variable dropped out of scope).

Currently stepping through a loop with 5 objects becomes an exercise in endurance as you keep having to re-expand all 5 every time you run around the loop =)