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bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns mis-decod

From: Stefan Monnier
Subject: bug#31149: 27.0.50; (gui-get-selection nil 'text/html) returns mis-decoded text
Date: Fri, 13 Apr 2018 16:55:26 -0400

Package: Emacs
Version: 27.0.50

(gui-get-selection nil 'text/html)

returns utf-16 text when the primary selection is owned by Mozilla, but
we decode it as latin-1 instead, so it looks like garbage.

I don't know why we're getting utf-16.  Is that what standards say it
should do?  If so, we should adjust our code (which currently knows
nothing about the `text/html` target-type).

As for why we decode it as latin-1, it's (under GNU/Linux; Lars may be
using something else because he's getting something with a `charset`
property which I don't get here) because:
- selection_data_to_lisp_data (in xselect.c) makes a unibyte string with
  the property `foreign-selection` set to `STRING` when the actual
  string type is not known (as opposed to COMPOUND-TEXT and
  UTF8-STRING, basically).
- in gui-get-selection we then have a mapping from `STRING` to
  `iso-8859-1` (which is apparently the right thing for the official
  `STRING` target-type in X11).

I can't figure out if/where these kinds of things about the X11
selection protocol is described, but at least in `xclip` they have
a hack specifically for this case:

    if (html != None && sel_type == html) {
        /* if the buffer contains UCS-2 (UTF-16), convert to
         * UTF-8.  Mozilla-based browsers do this for the
         * text/html target.

and according to the subsequent code it's not even always the
same endianness.

I don't know what is the difference between the `target-type` passed to
x-get-selection-internal and the `foreign-selection` property we get on
the returned string (they seem to be the same in my tests, except when
the type is not one of the known ones, and where we then force
`foreign-selection` to be `STRING`).


In GNU Emacs 27.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 2.24.32)
 of 2018-03-23 built on ceviche
Repository revision: ef4cd3805771e2cccd395d0f0b35f56816940508
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Debian GNU/Linux buster/sid

Recent messages:
Saving file /home/monnier/src/emacs/work/src/xselect.c...
Wrote /home/monnier/src/emacs/work/src/xselect.c
Mark set
user-error: Minibuffer window is not active
Mark set
Mark saved where search started
Mark set
Making completion list... [2 times]
Quit [2 times]
Mark set

Configured using:
 'configure -C --enable-checking --with-modules --enable-check-lisp-object-type
 'CFLAGS=-Wall -g3 -Og -Wno-pointer-sign'

Configured features:

Important settings:
  value of $LANG: fr_CH.UTF-8
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Major mode: InactiveMinibuffer

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Load-path shadows:
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/home/monnier/src/emacs/elpa/packages/hyperbole/set hides 
/home/monnier/src/emacs/elpa/packages/landmark/landmark hides 
/home/monnier/src/emacs/elpa/packages/crisp/crisp hides 

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Memory information:
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