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bug#31251: read-from-minibuffer sets print-escape-newlines; why?

From: Paul Eggert
Subject: bug#31251: read-from-minibuffer sets print-escape-newlines; why?
Date: Tue, 24 Apr 2018 14:31:55 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

read-from-minibuffer and related functions set print-escape-newlines in the minibuffer, but there's no clear reason why: these functions do not call 'prin1' or 'print' directly, and setting print-escape-newlines affects behavior only in seemingly unrelated areas, such as code executed indirectly via activate-input-method or minibuffer-setup-hook. If there's no need to set print-escape-newlines then it shouldn't be set; if there is a need, the need should be documented. For now I'll add a FIXME comment about this to Emacs master.

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