* Use XDT_CHECK_OPTIONAL_FEATURE
* Only GTK Layer Shell remains as a truly optional package, and
  therefore HAVE_GTK_LAYER_SHELL as a compiler switch, in addition to
  ENABLE_X11 and ENABLE_WAYLAND.

So user can extend or override the flags provided there by defining the
DISTCHECK_CONFIGURE_FLAGS variable.

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Rare, but it can happen, for example if the terminal from which the
panel is launched loses focus while
panel_window_active_window_monitors_idle() is waiting.

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This doesn't make sense. Libwnck handles this internally without any
obvious way for us to get the number of rows, so it's best not to allow
the user to change the number of rows in this case, as this will only
lead to bad results.

Completes: eeb9a578

It's simpler and getting the scale factor from the GdkWindow does not
work when the widget is not realized.

Closes: #789

It seems that the number of workspaces contained in a viewport is the
ratio of widths, at least when there is only one line. Not sure we
really support other cases.

Closes: #789
Fixes: 8f310b86

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DISPLAY should not be set on Wayland and this paves the way for the
addition of an implementation using an embedded composer (libwlembed).

This no longer seems necessary after the switch to libxfce4windowing for
some reason, but it could become necessary again, and it's not a problem
to give libwnck a little time to update the layout.

Fixes: #784

Amends: 77c3494f

In particular, do not change borders if none are set, as is the case
when the background is a solid color or an image. This caused a
regression in the application of struts or autohide, as the panel could
end up one pixel after the edge of the screen.

Fixes: fc422756

As mentioned in a comment in the code (wrapper-plug-x11.c), sending
geometry via D-Bus is more reliable and ultimately simpler than using
gtk_plug_get_socket_window(). For this reason, this change cannot be
backported to branch 4.18.

Fixes: #107

Fixes critical warnings on plug side about monitor not being set.

This seems better, since the menu is not linked to any panel widget in
this case (besides, the plugin button is not pressed). Using a
GtkInvisible instead of a panel widget is required after 8d576257, since
the grab would give the panel input focus.

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It was introduced in 89cfd529 without rationale, and it's not clear that
a save signal should be sent to plugins every ten minutes. On the
contrary, it seems that this should only be done on rare occasions,
typically on shutdown, which is retained. For the rest, it's up to each
plugin to manage its backups as it sees fit.

Fixes: #767

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