=> R0 = pointer to zero terminated filter name
R1 = addresss of filter code
R2 = value to be passed in R12
R3 = task handle of task to which filter was applied
<= all registers preserved
This SWI removes a Wimp_GetRectangle post-filter from the list.
Note: All registers must be the same as those passed to Filter_RegisterPostRectFilter.
*Note:* This is still only a 'guess' at the way it works.
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