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=> R0 = reason
R12 = workspace pointer passed to
OS_DynamicArea 0
Dynamic handler code controls what happens to a dynamic area as it is modified by the system.
Reason Meaning
0
PreGrow - the area is about to grow
1
PostGrow - the area has just grown
2
PreShrink - the area is about to shrink
3
PostShrink - the area has just shrunk
4
TestShrink - can we shrink?
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