Studio Plugin does not automatically resend data if the language server restarts

[hookSSi]

There is a problem connecting DM info the plugin to the LSP.
I know a workaround for this issue, but it’s a bit inconvenient. I was wondering if you could take a look at this when you have a chance.

Steps to Reproduce

1. Launch Roblox Studio
2. Run the plugin in Roblox Studio
3. Launch Cursor
4. Add any object in Roblox Studio to trigger a POST request
5. Verify that the plugin is connected to the LSP
6. Modify a file such as projectGlobalTypes.d.luau then reload the LSP
7. The plugin is no longer connected to the LSP (step 4 no longer works)
8. Restart Cursor
9. Perform step 4 again and verify the LSP connection (works correctly)

Environment

OS: Windows 11
IDE: cursor
Settings

{
    "editor.formatOnSave": true,
    "[luau]": {
        "editor.defaultFormatter": "JohnnyMorganz.stylua"
    },
    "luau-lsp.platform.type": "roblox",
    "luau-lsp.plugin.enabled": true,
    "luau-lsp.sourcemap.autogenerate": true,
    "luau-lsp.sourcemap.enabled": true,
    "luau-lsp.sourcemap.rojoPath": "./plugin/rojo.exe",
    "luau-lsp.types.robloxSecurityLevel": "RobloxScriptSecurity",
    "luau-lsp.hover.multilineFunctionDefinitions": true,
    "luau-lsp.inlayHints.hideHintsForErrorTypes": true,
    "luau-lsp.inlayHints.functionReturnTypes": true,
    "luau-lsp.inlayHints.parameterTypes": true,
    "luau-lsp.inlayHints.variableTypes": true,
    "luau-lsp.types.definitionFiles": {
        "roblox": "./types/globalTypes.d.luau",
        "project_ec": "./types/projectGlobalTypes.d.luau"
    },
    "luau-lsp.types.documentationFiles": [
        "./docs/ko-kr.json",
        "./docs/projectDocs.json"
    ],
    "luau-lsp.plugin.maximumRequestBodySize": "1000mb"
}

[JohnnyMorganz]

This one is a bit difficult to solve.

The problem in this case is that there is no real "heartbeat connection" between the LSP and the Studio Plugin. The Studio Plugin has no knowledge that the LSP server has restarted and lost the original state, and does not resend the data. It will only send new data from scratch when a change is made in Studio.

We'd need to introduce some sort of "GET /heartbeat" from the LSP client that the Studio Plugin sends to every couple seconds. The heartbeat could return a random unique identifier. If the Studio Plugin runs a heartbeat and sees the unique ID has changed, it should automatically resend the POST request.

Maybe switching to WebSockets could also help.

[plumbydev]

I can confirm this behavior on my end as well.

Reloading or restarting the LSP causes the Studio plugin to silently lose connection until the editor (Cursor / VS Code) is restarted. From the plugin side, everything still appears connected, but no new DM data is received by the LSP unless the plugin is reinitialized.