Anki add-on: Japanese Kanji Scraper

Finds any unique kanji in the Expression field of a note, and puts them in the Expression Kanji field. There is 1 trigger for this: Selecting a note in the browser screen and using the Edit > Scrape Expression Kanji button. I use this in my own personal Japanese sentence cards. If I do need a reference for the stroke order of a particular kanji, I can just include a section on the card with the stroke order font. Using this addon, I don't have to include the entire text of the card in the stroke order field, and I don't need to manually add specific kanji. So this saves time and, because the stroke order font has to be pretty big to be legible, it saves space too. 5/18/21 : Removed onFocusLost event hook, since it seems to be messing everything up. I just copied the Japanese Support addon, but I guess I am missing something.