Updated, v0.4.0 supports editing widget’s source code in WYSIWYG mode, the interaction is not very refined, some ideas in How to deal with wikitext like widget, macro in WYSIWYG editor? are not implemented.
Try out this new interaction in Slate Write 板书 — A WYSIWYG MD & WikiText editor 一个所见即所得 MD、WikiText 编辑器 !
Seems only macros can be properly updated…Still need to fix some bug in it.