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bug#27270: display-raw-bytes-as-hex generates ambiguous output for Emacs

From: Paul Eggert
Subject: bug#27270: display-raw-bytes-as-hex generates ambiguous output for Emacs strings
Date: Thu, 8 Jun 2017 08:56:31 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0

On 06/07/2017 06:07 PM, address@hidden wrote:
display-raw-bytes-as-hex does affect the result display for me (of
course, since the result goes into the buffer), doesn't it for you?

Sorry, it didn't when I tried it earlier, but apparently I messed up. Yes, it does affect the display.

But this means the problem is even worse than I thought. If I evaluate this in *scratch* in a terminal session running emacs -nw:

(setq display-raw-bytes-as-hex t) C-j
(format "%c%c" ?\u0090 ?5) C-j

Emacs displays this:


which is the wrong string visually. And if I cut this string out of the terminal window and paste it into another terminal window running Emacs, I'll get "अ" (a string containing the single character U+0905 DEVANAGARI LETTER A), which is indeed the wrong string. The string should be displayed unambiguously, either like this:

"\x80\ 5"

or via some other means.

The bottom line is that the visual display of buffers and strings should continue to be unambiguous even when display-raw-bytes-as-hex is t.

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