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[3.38] wayland/subsurface: Move placement ops to the parents pending state

Robert Mader requested to merge rmader/mutter:gnome-3-38-backport-1768 into gnome-3-38

Unlike other subsurface state, placement operations need to get applied in order. As per spec:

Requests are handled in order and applied immediately to a pending
state. The final pending state is copied to the active state the
next time the state of the parent surface is applied.

Having placement operations being part of the subsurface state makes it difficult to support arbitrary orderings. Make them part of the parents surface pending state instead.

Closes #1691 (closed)

Part-of: !1768 (merged)

(cherry picked from commit ba8499f9)

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