Annual request: is there a _small_ open source desktop WYSIWYG editor that supports in situ editing of diagrams? LibreOffice, MS Office, Google Docs all allow me to create a diagram inside a text doc and edit in place; I'm looking for something 10% their size that I can hack on. (All the "open source WYSIWYG editors" I can find are in-browser Markdown/HTML editors; if you want a diagram, you have to draw it externally and drop it in, which isn't what I want.)