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Even better when they also have "Why Not Quill" type content so you can quickly learn situations where it may not be the best fit. Every project makes tradeoffs and communicating those directly and clearly helps ensure users have a better experience.
I've used quill quite a bit. It's easy to integrate, the json delta format works decently well, and is pretty straightforward, but one thing I find myself doing whenever I use it is asking myself, "Should I just be using prosemirror?".
I find Quill to be a great stopgap solution for when I need editing and I need it quick, but in the back of my mind I'm always mentally adding that I'll need a migration plan should that specific feature ever grow in requirements.
I have been working with Quill v1 not long ago and oh boy it is not good. Pain to make tables work with plugins and weird scrolling issues. Hopefully v2 fixes a lot but I'm sticking with TinyMCE as it is superior in term of features.
Plain text return = new line.
Rich text return = new paragraph (shift + return = new line if you want).
This was a big problem for me with earlier versions, unsure how customizable this behaviour is now.
I do appreciate that I probably care too much about this, but I found TipTap worked well.