[Radiant] Can a behavior's tag processing code access the filter ID?

[Andrew Hodgkinson]

Is there a clean way for a behavior, within some code implementing a 
particular tag for that behavior, to access the ID of the text filter 
which is in effect during the moment when the tag is processed?

At the moment, I'm overriding the private parse_object method, storing 
object.filter_id in an instance variable and checking this inside the 
tag processing code. That's pretty nasty. Since parse_object is a 
private method it has every right to change signature, operation or even 
vanish in a future version of Radiant so the code I'm currently using is 
asking for trouble!

FWIW the real answer is that my behavior shouldn't be returning HTML 
from a tag expansion in the first place, so it shouldn't need to know; 
but I'm still curious about whether or not there's a better way to do 
this.

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