|   In old days, you used to be able to click on the Debug button of a
| notifier, move the pointer in the stack list pane (but not clicking),
| and press Alt-t to start debugging right away.  This was convenient
| when you put 'self halt'.  Now, this operation raises an error.  This
| change set fixes the problem.
|

This is a Single line change in Debugger>>checkContextSelection:

original:
contextStackIndex = 0 ifTrue: [contextStackIndex _ 1]
changed:
contextStackIndex = 0 ifTrue: [self context StackIndex: 1 oldContextWas:
nil].

This ensures correct initialisation. 
checkContextSelection is called on doStep, proceed, restart, send,
all of them work fine afterwards. 
















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