WIP: exploring multi-root workspace protocol in vscode + boot java ls

Note: this code is not working, probably better to start over when the
time comes. This branch is saved just in case it helps seeing the kinds
of changes we might want/need to do.

vscode-extensions/commons-vscode/src/launch-util.ts

@@ -16,6 +16,7 @@ import { Trace, NotificationType } from 'vscode-jsonrpc';
 import * as P2C from 'vscode-languageclient/lib/protocolConverter';
 import {WorkspaceEdit, Position} from 'vscode-languageserver-types';
 import {HighlightService, HighlightParams} from './highlight-service';
+import { log } from 'util';
 
 let p2c = P2C.createConverter();
 
@@ -83,7 +84,8 @@ export function activate(options: ActivatorOptions, context: VSCode.ExtensionCon
                                 reader: socket,
                                 writer: socket
                             });
-                        }).listen(port, () => {
+                        })
+                        .listen(port, () => {
                             let processLaunchoptions = {
                                 cwd: VSCode.workspace.rootPath
                             };
@@ -151,6 +153,8 @@ function setupLanguageClient(context: VSCode.ExtensionContext, createServer: Ser
     let client = new LanguageClient(options.extensionId, options.extensionId,
         createServer, options.clientOptions
     );
+    client.registerProposedFeatures();
+    log("Proposed protocol extensions loaded!");
     if (options.TRACE) {
         client.trace = Trace.Verbose;
     }