[Bug-gnubg] Strange behavior after interrupting 'thinking'

[Nardy Pillards]

Win32 build, GTK GUI.

Undo move to show User's move.
Play button grayed out, although it has to be active.

1. After submitting a move, Tutor starts evaluating (or analysing) that
move.
When the Tutor pops up, click 'Hint' to see the Hint window. Choose a move
and click 'move' button.
Click the 'Stop the current Operation' button (x button) while GNU is
'thinking'.
Click the 'Undo Moves' button (<- button) shows the chosen move and
activates the 'Force computer to play' button (Play button).

Same scenario when interrupting Tutor and choosing 'Play anyway'.
The Undo Move must be clicked before the Play becomes active.

Same scenario when asking a Hint before a move. Choose one and click 'Move'.
Then interrupt.

All three times: clicking Undo Move does show the move and activates the
'Play' button.

2. While GNU is thinking, hit the 'Stop the current Operation' button. (x
button).
Now just clicking 'Undo Moves' button (<- button) forces GNU to move and
pick up the dice.


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Nardy