bug#32977: 26.1.50; Emacs (on gnome 3, wayland, debian buster) calculates incorrect horizontal positions

[Kai Tetzlaff]

The following happens within Gnome 3 (3.30, but also earlier versions),
Wayland on Debian Buster on a Laptop with HiDPI display with fractional
scaling factor set to 1.5.

Position frame at the left border of the display, evaluate:

    (frame-parameter (selected-frame) 'left)
    ;; -10

or

    (car (frame-position (selected-frame)))
    ;; '(+ -10)

The horizontal frame position should be 0, instead it gets reported as
-10 (indicating that part of the frame is invisible - which is not the
case). Even if the frame is positioned within the first 9 pixel
positions, the result is still negative.


In GNU Emacs 26.1.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-09-15 built on moka
Repository revision: 20ecc5266e1ffb1cff3e31475631b5c76b99e997
Windowing system distributor 'The X.Org Foundation', version 11.0.12001000
System Description:     Debian GNU/Linux testing (buster)

Recent messages:
Wrote /home/kail/.emacs.d/init/user/kai_tetzlaff.el
Mark set [8 times]
Auto-saving...
Mark set [2 times]
Quit
Mark set [6 times]
Auto-saving...done
Saving file /home/kail/.emacs.d/init/user/kai_tetzlaff.el...
Wrote /home/kail/.emacs.d/init/user/kai_tetzlaff.el
Computing completion candidates... [2 times]

Configured using:
 'configure --with-modules --with-xwidgets'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD LCMS2

Important settings:
  value of $LC_COLLATE: de_DE.UTF-8
  value of $LC_CTYPE: de_DE.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LC_MONETARY: de_DE.UTF-8
  value of $LC_NUMERIC: de_DE.UTF-8
  value of $LC_TIME: de_DE.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
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Load-path shadows:
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/home/kail/.emacs.d/elpa/perlcritic-1.10/perlcritic
/home/kail/.emacs.d/lisp/yaml-mode hides 
/home/kail/.emacs.d/elpa/yaml-mode-0.0.13/yaml-mode
/home/kail/.emacs.d/lisp/adams/ls-lisp hides 
/usr/local/share/emacs/26.1.50/lisp/ls-lisp
/home/kail/.emacs.d/lisp/tempo hides /usr/local/share/emacs/26.1.50/lisp/tempo
/home/kail/.emacs.d/lisp/cc-mode/cc-guess hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-guess
/home/kail/.emacs.d/lisp/cc-mode/cc-bytecomp hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-bytecomp
/home/kail/.emacs.d/lisp/cc-mode/cc-engine hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-engine
/home/kail/.emacs.d/lisp/cc-mode/cc-fonts hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-fonts
/home/kail/.emacs.d/lisp/cc-mode/cc-cmds hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-cmds
/home/kail/.emacs.d/lisp/cc-mode/cc-langs hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-langs
/home/kail/.emacs.d/lisp/cc-mode/cc-mode hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-mode
/home/kail/.emacs.d/lisp/cc-mode/cc-styles hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-styles
/home/kail/.emacs.d/lisp/cc-mode/cc-vars hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-vars
/home/kail/.emacs.d/lisp/cc-mode/cc-align hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-align
/home/kail/.emacs.d/lisp/cc-mode/cc-menus hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-menus
/home/kail/.emacs.d/lisp/cc-mode/cc-defs hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-defs
/home/kail/.emacs.d/lisp/cc-mode/cc-awk hides 
/usr/local/share/emacs/26.1.50/lisp/progmodes/cc-awk

Features:
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Memory information:
((conses 16 554725 49389)
 (symbols 48 47965 4)
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