Fix for Squeak 3.7/3.8 and Squeakland release.

from preamble:

"Change Set:		DoubleEventNotifyFix-nk
Date:			6 September 2004
Author:			Ned Konz

Since Utilities>>event: was signaling an InMidstOfFileinNotification,
the WeakActionSequenceTrappingErrors was re-sending the notifications.

Instead of trapping any Exception, the WeakActionSequenceTrappingErrors
should have been looking for Halt and Error.

This change set modifies the WeakActionSequenceTrappingErrors to ignore
Notifications.

"!
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