Shrinkable areas are created with bit 9 of r4 set. They may be shrunk by the kernel when free memory is about to be exhausted. Shrinkable areas must have a handler routine. A new handler reason code is used for Shrinkable areas: TestShrink.
Efficiency and Shrinkable areas
Shrinkable areas should be used sparingly due to the load on the kernel whenever free memory must be calculated (e.g. for every Wimp_SlotSize call).
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