On Thu, Nov 8, 2018 at 12:35 PM Sebastian Geiger (Lanoxx)
<lan...@gmx.net> wrote:
> I was able to resolve the issue yesterday, and found that it was not
> directly a Problem of GTK+.

To some extent it is, I don't think its API currently allows what you
are trying to do.

On X11, the WM is a client like your app as far as screen changes are
concerned. It will update the _NET_WORKAREA property in response to
the size change, but I don't see how it would be possible to ensure
that the property is written before the server notifies other clients
about the size change. But let's assume that this was possible and
fixed. It would still be possible for your app to get the wrong work
area, because the area can change without a change in screen size (for
example a dock or panel that is shown or removed).

So if this is something GTK+ wants to support, then I think the best
option would be to emit change notifications for GdkMonitor:workarea.

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