Related?: [gtk+] Remove support for GDK_NATIVE_WINDOWS

https://mail.gnome.org/archives/commits-list/2011-March/msg03590.html

Also:

$dnf info gtk3
Last metadata expiration check: 1:19:22 ago on Wed Oct 12 12:22:14 2016.

Installed Packages
Name        : gtk3
Arch        : x86_64
Epoch       : 0
Version     : 3.20.9
Release     : 1.fc24
Size        : 17 M
Repo        : @System
From repo   : updates
Summary     : The GIMP ToolKit (GTK+), a library for creating GUIs for X
URL         : http://www.gtk.org
License     : LGPLv2+
Description : GTK+ is a multi-platform toolkit for creating graphical user
            : interfaces. Offering a complete set of widgets, GTK+ is suitable for
            : projects ranging from small one-off tools to complete application
            : suites.
            : 
            : This package contains version 3 of GTK+.

I can't reproduce this with emacs-25.1-1.fc24.x86_64. Do you run 'emacs -Q' ? Can you reproduce the bug with a simple window manager, like i3 or openbox?

o Same behavior using emacs -Q 
o Correct behavior under i3wm!

(also wondering if my hidpi screen or the Gnome settings I changed to accomodate that, has something to do with it -- I'll experiment and report).

Created attachment 1281117 [details]
tarred directory containing two dummy files to use in repro recipe

I have a repro case that succeeds under one setting and fails under another. The problem seems to be related to Gnome HiDPI settings. 

Using gnome-tweak-tool, choose "Windows" from the left hand "Tweaks" column. The default setting for "HiDPI Window Scaling" in the right-hand pane is 1. When it is set to one, emacs menu behavior is correct. When I set it to 2, the behavior I outlined occurs. I am now running Fedora 25 and I've had to change the repro recipe a little. I'm uploading a small directory containing two files. 

1. Set Gnome HiDPI Window Scaling to 2 as described above.
2. cd to emacs-menubug-repro
3. start emacs -Q -q .
4. ^X-F open-me-first.py
5. ^X-F open-me-second.html
6. Using mouse, click "SGML" menu


Expected: rectangle containing full SGML menu contents
Actual: Tiny empty rectangle underneath the SGML menu title.


--------------------------------------------------------------------------------------

$ uname -a
Linux t5600 4.10.15-200.fc25.x86_64 #1 SMP Mon May 8 18:46:06 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

$ dnf info emacs
Last metadata expiration check: 0:00:57 ago on Mon May 22 10:17:03 2017.
Installed Packages
Name        : emacs
Arch        : x86_64
Epoch       : 1
Version     : 25.2
Release     : 2.fc25
Size        : 16 M
Repo        : @System
From repo   : updates
Summary     : GNU Emacs text editor
URL         : http://www.gnu.org/software/emacs/
License     : GPLv3+ and CC0-1.0
Description : Emacs is a powerful, customizable, self-documenting, modeless text
            : editor. Emacs contains special code editing features, a scripting
            : language (elisp), and the capability to read mail, news, and more
            : without leaving the editor.
            : 
            : This package provides an emacs binary with support for X windows.

Not trying to rush anything... just making sure people are aware I made a reproducible case in the previous upload. And I'd like to confirm that others are able to reproduce it. Thanks.

Yes, I managed to reproduce the problem using the steps in comment 5. The important thing to reproduce this is setting the scaling and switching to the html buffer. I also retested this under Wayland as well as Xorg, both result in the faulty behavior. Also happens on F26.

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=27667

Also see https://bugzilla.redhat.com/show_bug.cgi?id=1471258 and http://git.savannah.gnu.org/cgit/emacs.git/tree/etc/PROBLEMS?h=emacs-25#n1017.

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