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=>     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 pre-filter from the list.

Note: All must be the same as those passed to Filter_RegisterRectFilter.

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