effective span of a TextBuffer's tag?

Say a tag T with attributes such as 
was set/applied to a range R = [iter_begin, iter_end).


1. Assuming no other tag was applied, is the text 
   after iter_end effected  by T?
2. If a text is inserted in the middle of  [iter_begin, iter_end)
   is it effected by the tag ?

3. When a text containing R is extracted and inserted (copy and paste) 
   elsewhere, does it carry any of T's attributes ?

-- yotam

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