I've been doing more and more writing lately, and have been wishing for a tool that allows me to write my outlines, drafts, and final compositions in the same editor window with the ability to toggle any of those "layers" on and off at will, merge them, copy selections to new layers, etc. It would work sort of like Photoshop but for writing... I have a feeling these principles could also work as an IDE extension (imagine being able to hide the "code" layer and show only the "comments" layer, or the "documentation" layer). Curious to hear your thoughts, or whether anyone else is working on something similar?