The DAP spec has officially added support for multi-session debug adapters - microsoft/debug-adapter-protocol#344 🎉 🎉 🎉

According to @connor4312 in microsoft/vscode-js-debug#902 (comment):

Fyi this will soon be compliant with the adoption of microsoft/debug-adapter-protocol#79 this month, though DAP clients may take longer to update.

This plugin currently runs in a hacky/non-intended way, and my hope is that by adhering to a unified specification, issues like #14, #6, and #1 may be solved (fingers crossed). Even if they are not solved, it will be significantly easier to properly investigate these issues, as well as to determine if they are usage issues or just bugs in the vscode adapter.

The first goal is implementation into nvim-dap, which is slated for implementation. Then I can implement that into this plugin, which will (I think) significantly cut down on the required amount of code.

The second goal is perhaps to implement this hierarchy tree as part of nvim-dap-ui, assuming that the maintainers there are interested in such a feature.