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As discussed on https://lists.freedesktop.org/archives/wayland-devel/2017-August/034720.html , it's useful for the shell implementation to know when these change, for example to relay the information on to taskbars or similar. To avoid ABI changes or the need to make the weston_desktop_surface definition public, new functions are introduced for attaching listeners to these signals. Signed-off-by:
Matt Hoosier <matt.hoosier@gmail.com> Reviewed-by:
Quentin Glidic <sardemff7+git@sardemff7.net>