Feature request: an option to add words to be ignored by AutoSpellCheck (like adding to the dictionary list) but are saved on a per-document basis.

The reason why: sometimes there are words that should be ignored by the autospellcheck, but are used in special cases and thus shouldn't be added to the system-wide dictionary.  It becomes a hassle to the user to have to select these words and specify "ignore all" every time the user opens the document.  Often times a user just ignores the auto-spell-check themselves, which leads to other words getting ignored, misspellings of that same word getting missed, and more.

Enabling an ignore list to be embedded into the file itself ensures that these odd-cases are not permanently added to the standard dictionary file, but enables the benefits of doing such for just that one document without impacting all documents that a user handles.

Some realistic cases where this would be helpful:

-Writing fiction, especially for Fantasy and Sci-Fi.  Such stories frequently use character names and other elements that a user wouldn't consider "real" and thus wouldn't want to add to the standard dictionary, but would show up frequently within that one document.

-Writing about new products.  New products often have unique names to make them trademarkable, but it is not always in the interest of a company to add that name permanently into their database of ignored words, such as when comparing to other products or for companies that write reviews.

-Foreign names.  Sometimes a foreign surname appears frequently within a single document.  The name may be close to another word, which makes it subject to appearing as a typo.  Or it may be a rarely used name that wouldn't be used outside that document.  Or it might be too foreign for a user to be certain that the name is the "universally correct version," and does not want to risk confusing the name with other variants in the future.