[3.6] IDLE: make filetypes a tuple constant. (GH-3847) #3848
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Save a bit of code, plus non-tuples get converted anyway to tuples by tkinter for the tk call.
(cherry picked from commit 5961e7c)
!!! If this is a backport PR (PR made against branches other than
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GH-NNNN refers to the PR number from
master.PLEASE: Remove this headline!!!