Most user actions now go through vebugger#userAction, which calls the
user action on the active debugger object. The exceptions are:
- Starting the debugger - because we don't have an active debugger yet
- Stopping the debugger - because we'll need to clear the active
debugger after that
- Altering breakpoints - because we want to be able to do it even
without an active debugger(e.g. - setting breakpoints before starting
the debugger)
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