Bug: emacs-X11 25.1.1 within "XWin -multiwindow" control-frame only shows "\"

[Tobias Zawada]

Dear cygwin heroes,
I am experiencing an error with the combination of XWin.exe -multiwindow and
emacs-X11.

Receipt for reconstruction:
XWin-version:

> Welcome to the XWin X Server
> Vendor: The Cygwin/X Project
> Release: 1.18.4.0
> OS: CYGWIN_NT-10.0 DREWOR020 2.8.0(0.309/5/3) 2017-04-01 20:47 x86_64
> OS: Windows 10 [Windows NT 10.0 build 15063] (Win64)
> Package: version 1.18.4-1 built 2016-07-22

emacs-version:

> GNU Emacs 25.1.1 (x86_64-unknown-cygwin, GTK+ Version 3.18.9)

Start emacs with:

> emacs -Q

Compare two arbitrary buffers with

> M-x ediff-buffers

The minimized ediff-control-frame only shows:

> \

I am expecting in the ediff-control-frame something like:

> Type ? for help
> _/1

If I started emacs in a mintty (2.7.8) I get there the following warning:

> (emacs-X11:1832): Gtk-WARNING **: gtk_window_parse_geometry() called on a
> window with no visible children;
> the window should be set up before gtk_window_parse_geometry() is called.

The error does not occur with

> XWin -rootless &
> twm.exe &

cygcheck.out is attached.

Note: I had to remove all duplicated lines from cygcheck.out to avoid the
message size limit of the mail server.

Best regards,
Tobias
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