This implementation is far simpler than c0d7e71 as it takes advantage of
wlroots's tracking of pending state.
Additionally, we now send frame done events if a view that we are
configuring commits with the wrong dimensions. This is necessary in
order to trigger a redraw for some clients as well as being a more
correct implementation of the protocol.
when a transaction interrupts an ongoing transaction, we must be careful
to handle the configures properly. This commit adds a new member to view
so that we can store the dimensions sent with the last configure in
order to determine if the preempting transaction should override the
ongoing configure or not.
Additionally, some views do not ack a configure if they already have the
requested dimensions. This can happen if a pending configure setting
alternative dimensions is overridden, so in this case we do not wait for
an ack before committing the transaction.
