Re:Slate JS – A customizable framework for building rich tex...
by wangyjx on Thursday November 15, 2018 @06:47AM
(#18458521)
The confluence's editor somewhat meet your needs.
Re:Slate JS – A customizable framework for building rich tex...
by devwastaken on Friday November 16, 2018 @02:34AM
(#18467183)
Good call, though it's commercial as usual.
I believe wordpress has had some commercial plugins that could do this well, but I have not found an open source editor that redefines rich text editing at all.