Add incremental sync experimental option

package.json

@@ -982,6 +982,11 @@
               "type": "boolean",
               "default": false,
               "description": "If true, the language server will provide build, vet errors and the extension will ignore the `buildOnSave`, `vetOnSave` settings."
+            },
+            "incrementalSync": {
+              "type": "boolean",
+              "default": false,
+              "description": "If true, the language server will accept incremental document synchronization."
             }
           },
           "default": {
@@ -1435,4 +1440,4 @@
       ]
     }
   }
-}
+}

src/goMain.ts

@@ -129,9 +129,10 @@ export function activate(ctx: vscode.ExtensionContext): void {
 				{
 					initializationOptions: {
 						funcSnippetEnabled: vscode.workspace.getConfiguration('go')['useCodeSnippetsOnFunctionSuggest'],
-						gocodeCompletionEnabled: languageServerExperimentalFeatures['autoComplete']
+						gocodeCompletionEnabled: languageServerExperimentalFeatures['autoComplete'],
+						incrementalSync: languageServerExperimentalFeatures['incrementalSync']
 					},
-					documentSelector: ['go'],
+					documentSelector: ['go', 'go.mod', 'go.sum'],
 					uriConverters: {
 						// Apply file:/// scheme to all file paths.
 						code2Protocol: (uri: vscode.Uri): string => (uri.scheme ? uri : uri.with({ scheme: 'file' })).toString(),