Save button - return canvas

[dakom]

Crops canvas to content

Generates a new canvas element, cropped to content.

For examples:

• if there's only "Hello World" english text, it will be a small rectangle.
• if there's both English and Hebrew, it will be the full-width
• only in the case of using the entire screen area, will it be the full area

It should then call a callback which was supplied via a top-level prop, with both the original targetCanvas and this newly created cropped canvas

The return here is in addition to https://github.com/jewish-interactive/draft-canvas/issues/22

[jpuri]

Should this canvas element be hidden or visible to the user ?

[dakom]

It should be invisible - purely an in-memory node

[jpuri]

This feature is half implemented, save button is added and it sends back the rendered Canvas node, I am still working on the invisible canvas node.

[jpuri]

On save it will now return an object with 2 parameters {rawDraftContentState, canvas}.