[ogoffart]

I use the the code lenses of code action feature of the LSP so that the user can start a preview. The LSP server will then open a native window on desktop.

Every time the users do some change in the code, the editor sends the document and we re-render the preview.

I use the textDocument/documentHighlight request to know when elements are being selected from the code so I can highlight them in the preview.

When selecting an element in the preview UI, my LSP server sends a window/showDocument to position the cursor at the right location. And if the user changes property or do change in the file, we do a workspace/applyEdit command with the changes.

Btw, the code is there: https://github.com/slint-ui/slint/tree/master/tools/lsp