[Wayland-bugs] [Bug 779143] New: add a way to change the app_id of a window so LibreOffice can reuse toplevels and get the right task icons

[gtk+ (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779143

            Bug ID: 779143
           Summary: add a way to change the app_id of a window so
                    LibreOffice can reuse toplevels and get the right task
                    icons
    Classification: Platform
           Product: gtk+
           Version: 3.22.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
          Assignee: gtk-bugs at gtk.org
          Reporter: caolanm at redhat.com
        QA Contact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 346588
  --> https://bugzilla.gnome.org/attachment.cgi?id=346588&action=edit
patch to do this

LibreOffice recycles toplevel windows, e.g. writer to start center to calc.
Under X we can use XSetClassHint to keep the WM_CLASS in sync so we get the
right icons in the task switcher. I don't see a way to hack around this under
wayland, hence the attached suggested patch for gtk itself to gain access to
setting the wayland app_id equivalent

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