I would love to see a :tree-sitter-tree command that opens a side buffer containing the full document parse tree. This exists in Zed and Neovim:

:tree-sitter-subtree can work in most cases, if you just select the entire document and then run the command. But it is not ergonomic to use; the popup sticks around to where the cursor is, and only stays visible in visual mode - you can't edit the document and still see the tree.

I would try to implement this myself but I'm not sure how to go about programatically creating a new buffer panel to the side with set dimensions and all that. The rest of the code can easily be copied from the existing command source, without the selection-related stuff.