Create a mechanism to update the annotations on a document when the document is edited

When a document is edited, the annotations already added on the document should preserve their positions, as much as possible, and include the new text additions or modifications. It should be able to:

• preserve annotations if a typo is fixed inside the marked by an annotation
• preserve the position of the annotation as much as possible for more radical updates
• in the above cases, the initial marked content of the annotation should be stored for semantic purposes (if the annotation metadata is no longer coherent with the newly selected text, one should be able to see the original text)
• if the content annotated is removed completely, then the annotation should be preserved (because the metadata it contains is useful information) but marked somehow as being "unrenderable"