DAP ContinuedEvent with allThreadsContinued=true causes selected debug session to change

When sending a `ContinuedEvent` with `allThreadsContinued=true`, the selected debug session resets to the first one. This does not happen without `allThreadsContinued=true`.  To repro: - Clone MockDebug - Add `response.body.supportsRestartRequest = true;` in `initializeRequest` - Implement a `restartRequest` that sends a `ContinuedEvent` with `allThreadsContinued=true`: ```ts protected async restartRequest(response: DebugProtocol.RestartResponse, args: DebugProtocol.RestartArguments) { this.sendResponse(response); this.sendEvent(new ContinuedEvent(0, true)); } ``` - Run the project - Create a second launch config: ```js "configurations": [ { "type": "mock", "request": "launch", "name": "Debug readme.md 1", "program": "${workspaceFolder}/readme.md", "stopOnEntry": true, "trace": false }, { "type": "mock", "request": "launch", "name": "Debug readme.md 2", "program": "${workspaceFolder}/readme.md", "stopOnEntry": true, "trace": false } ] ``` - Start both launch configurations (this can be done one at a time) - Select the second debug session in the debug toolbar - Click the Restart button - Note that the dropdown has reverted to the first session