Allow resizer to reset its state.

[heaven-born]

Here is my use case:

The state of my node depends on the zoom level. Each state may have different characteristics including size and resizability options.

Issue:

When I use resizer on one of my states it fixes node size in the "width/height" parameters of the hidden wrapping node and preserves this size even if the resizer is hidden for other states. There is no easy way to hide or "reset" the resizer effect that I don't need in the other states.

Proposal options:

1. Add a "preserve" flag on the resizer with a default value of "true" that will be used to decide whether to "hide" the "width/height" values from the parent node when the resizer is hidden.

or/and (less technical approach)

2. Add a helper to reset the "width/height" to the state "before resized"