gnome-shell fails to choose correct application icon when running pgtk build under wayland

[alexmurray]

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The generic icon is shown with a title of "emacs-wayland"

GNOME Shell looking glass also shows this as the WMClass:

Yet the environment variable seems set correctly in the running instance:

(getenv "DESKTOP_STARTUP_ID")

gnome-shell/Emacs/9961-2-graphene_TIME8078906

Which I assume matches against the desktop file in the snap:

grep WMClass /var/lib/snapd/desktop/applications/emacs_emacs.desktop

StartupWMClass=Emacs