Gets or sets a value indicating whether the save appends an incremental update to the document's file instead of writing a
complete new one. The default is false.
public bool IncrementalUpdate { get; set; }
ISO 32000-2 §7.5.6. The written file is every byte of the file the document was read from, unchanged, followed by the objects
that were changed or added since it was read (or since the last incremental save), a cross-reference section listing only them
and the objects removed, and a trailer whose Prev entry points at the previous section. The section has the form of the
file's newest one: a cross-reference stream after a stream (§7.5.8), a classic table otherwise, including after a hybrid file's
table (§7.5.8.4). Objects keep their numbers; a removed object's entry is free with its generation raised by one.
CrossReferenceLayout, ObjectNumbering and RemoveUnreachableObjects do not apply to an update. StreamCompression applies to the streams the update writes, which are all new or changed, so ChangedStreams and AllStreams compress the same ones. Once the last byte is written, the document reads from the written file and its objects are no longer dirty, so the next incremental save appends only what changes after this one.