bug#41719: 28.0.50; emacsclient -c -F '((name . "NAME"))' is not respected --with-x-toolkit=gtk3

[Vladimir Lomov <lomov.vl@yandex.ru>]

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Hello,
** Dmitry Alexandrov <dag@gnui.org> [2020-06-07 19:15:40 +0300]:

> Vladimir Lomov <lomov.vl@yandex.ru> wrote:

>> So, emacsclient with -F

> (make-frame '((name . "NAME"))), actually.

>> should change 'instance' but when Emacs is build with GTK/GTK3 emacs
>> doesn't change it. Do I correctly understand this?

> Only with GTK3.  GTK2 is fine as well.

>> Is it mean that this is a bug?

> If a missing feature, that is present on a slightly different platform, is a
> bug. Itʼs not necessary a bug in Emacs, though. Maybe, besides declaring a
> ability to set a window class deprecated [1], GTK developers had actually
> broken it.

> [1] <https://developer.gnome.org/gtk3/stable/GtkWindow.html#gtk-window-set-wmclass>:

> |	gtk_window_set_wmclass has been deprecated since version 3.22 and should not be used in newly-written code.
> |
> | Don’t use this function. It sets the X Window System “class” and “name”
> | hints for a window. According to the ICCCM, you should always set these to
> | the same value for all windows in an application, and GTK+ sets them to that
> | value by default, so calling this function is sort of pointless. However,
> | you may want to call gtk_window_set_role() on each window in your
> | application, for the benefit of the session manager. Setting the role allows
> | the window manager to restore window positions when loading a saved session.

So, this is dead-end but I'm glad that 'role' is still kept. Is it possible to
implement this ('role' instead of 'instance') in gtk backend and in
emacsclient?

---
WBR, Vladimir Lomov

-- 
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Control and meta, side by side,
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Oh, I sure wish that I,
Had a couple of bits more!
Perhaps a set of pedals to make the number of bits four.

Double Double Bucky!  Double Bucky left and right
OR'd together, outta sight!
Double Bucky, I'd like a whole word of,
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		-- to Nicholas Wirth, who suggested that an extra bit
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		by screen editors.  [to the tune of "Rubber Ducky"]

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