Olivier Guyot 1f379a06a4 View / add support for viewport extent constraint ...

This introduces a breaking change:

The `extent` view option now constrains the whole viewport and not just the
view center.
The option `constrainOnlyCenter` was added to keep the previous behaviour.

Constraining the whole viewport and not only the view center means
that the center and resolution constraints must be applied with a knowledge of
the viewport size.

2019-02-22 15:01:30 +01:00

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