JSD2: Stepping

Steps to reproduce

  1. Disable the Script panel (you need to refresh the page after this action)
  2. Enable the Debugger panel
  3. Click the breakpoint column to create a breakpoint on line 12
  4. Click this button:
  5. The debugger should break at line 12
  6. Use step-in. step-over, step-out, resume (toolbar buttons or key-shortcuts)