Issue 5019: Editing a variable in the Watch window doesn't work

Steps to reproduce

  1. Open Firebug, enable the Script panel, reload.
  2. Click this button
  3. The debugger should halt at line 17
  4. Select the Watch side panel
  5. Change value of variable a to 200
  6. Change value of variable b to helloworld
  7. Toggle value of variable c to true (by double click)
  8. Resume the debugger and select the Console panel
  9. You should see following log: 200 helloworld true