Check if we can use static width/height for the computed values as well

[moklick]

We might be able to reduce the issues about dimensions with v12, if users don't have to apply dimensions changes if width and height are set.

[moklick]

This is probably not a good idea because the behaviour would be inconsistent for flows that use node.width/node.height and those who don't. The questions remains if it's a good idea to handle dimension updates with onNodeChanges..

[moklick]

We decided to keep the dimension changes and store the information in node.measured.