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bug#25599: Why edit markers after insert?

From: nitish chandra
Subject: bug#25599: Why edit markers after insert?
Date: Wed, 8 Mar 2017 21:44:59 +0530
In primitive-undo in simple.el, aroud line 2550 (in master) we adjust the markers after the insertion.

(dolist (adj valid-marker-adjustments)
               (set-marker (car adj)
                           (- (car adj) (cdr adj))))

Why is this needed? Won't insert take care of adjusting the markers?
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