Fix auto-insert ignoring language-specific editor.tabSize

src/lsptoolshost/autoInsert/onAutoInsert.ts

@@ -4,7 +4,6 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-
 import {
     FormattingOptions,
     InsertTextFormat,
@@ -82,10 +81,20 @@ export function registerOnAutoInsert(languageServer: RoslynLanguageServer, langu
         // We need to calculate what that position would be after the change is applied and send that to the server.
         const position = vscodeRange.start.translate(0, change.text.length - rangeLength);
 
+        const formattingOptions = getFormattingOptions(document);
+
         source.cancel();
         source = new vscode.CancellationTokenSource();
         try {
-            await applyAutoInsertEdit(position, changeTrimmed, e.textDocument, uri, languageServer, source.token);
+            await applyAutoInsertEdit(
+                position,
+                changeTrimmed,
+                e.textDocument,
+                uri,
+                formattingOptions,
+                languageServer,
+                source.token
+            );
         } catch (e) {
             if (e instanceof vscode.CancellationError) {
                 return;
@@ -101,10 +110,10 @@ async function applyAutoInsertEdit(
     changeTextTrimmed: string,
     textDocumentIdentifier: TextDocumentIdentifier,
     uri: vscode.Uri,
+    formattingOptions: FormattingOptions,
     languageServer: RoslynLanguageServer,
     token: vscode.CancellationToken
 ) {
-    const formattingOptions = getFormattingOptions();
     const request: RoslynProtocol.OnAutoInsertParams = {
         _vs_textDocument: textDocumentIdentifier,
         _vs_position: position,
@@ -142,9 +151,18 @@ async function applyAutoInsertEdit(
     }
 }
 
-function getFormattingOptions(): FormattingOptions {
-    const editorConfig = vscode.workspace.getConfiguration('editor');
-    const tabSize = editorConfig.get<number>('tabSize') ?? 4;
-    const insertSpaces = editorConfig.get<boolean>('insertSpaces') ?? true;
+function getFormattingOptions(document: vscode.TextDocument): FormattingOptions {
+    const editorSettings = vscode.workspace.getConfiguration('editor', document);
+    const detectIndentation = editorSettings.get<boolean>('detectIndentation');
+
+    const editor = detectIndentation
+        ? vscode.window.visibleTextEditors.find((e) => e.document === document)
+        : undefined;
+
+    // VSCode guarantees that retrieving the editor.options.tabSize will return a number
+    const tabSize = (editor?.options.tabSize as number | undefined) ?? editorSettings.get<number>('tabSize') ?? 4;
+    // VSCode guarantees that retrieving the editor.options.insertSpaces will return a boolean
+    const insertSpaces =
+        (editor?.options.insertSpaces as boolean | undefined) ?? editorSettings.get<boolean>('insertSpaces') ?? true;
     return FormattingOptions.create(tabSize, insertSpaces);
 }

test/lsptoolshost/integrationTests/onAutoInsert.integration.test.ts

@@ -11,7 +11,6 @@ import {
     closeAllEditorsAsync,
     openFileInWorkspaceAsync,
     revertActiveFile,
-    sleep,
     waitForExpectedResult,
 } from './integrationHelpers';
 import { describe, beforeAll, beforeEach, afterAll, test, expect, afterEach } from '@jest/globals';
@@ -36,7 +35,6 @@ describe(`OnAutoInsert Tests`, () => {
     });
 
     test('Triple slash inserts doc comment snippet', async () => {
-        await sleep(1);
         await vscode.window.activeTextEditor!.edit((editBuilder) => {
             editBuilder.insert(new vscode.Position(2, 6), '/');
         });
@@ -110,6 +108,65 @@ describe(`OnAutoInsert Tests`, () => {
             }
         );
     });
+
+    test('Enter inside braces respects language-specific tabSize', async () => {
+        // Set global tabSize to 2 and C# tabSize to 4
+        const globalConfig = vscode.workspace.getConfiguration('editor');
+        const csharpConfig = vscode.workspace.getConfiguration('editor', {
+            languageId: 'csharp',
+            uri: vscode.window.activeTextEditor!.document.uri,
+        });
+
+        const originalGlobalTabSize = globalConfig.get('tabSize');
+        const originalCsharpTabSize = csharpConfig.get('tabSize');
+
+        try {
+            // Turn off detect indentation to ensure it consistently uses the settings.
+            await globalConfig.update('detectIndentation', false, vscode.ConfigurationTarget.Global);
+
+            // Customize tab sizes
+            await globalConfig.update('tabSize', 4, vscode.ConfigurationTarget.Global);
+            await csharpConfig.update('tabSize', 2, vscode.ConfigurationTarget.Global);
+
+            await vscode.window.activeTextEditor!.edit((editBuilder) => {
+                editBuilder.insert(new vscode.Position(11, 15), '\n');
+            });
+
+            const expectedLines = [
+                'class DocComments',
+                '{',
+                '    //',
+                '    string M(int param1, string param2)',
+                '    {',
+                '        return null;',
+                '    }',
+                '',
+                '    /// <summary>',
+                '',
+                '    /// </summary>',
+                '    void M2()',
+                '  {',
+                '    ', // Should be 2 spaces (C# setting), not 4 (global setting)
+                '  }',
+                '}',
+                '',
+            ];
+
+            await waitForExpectedResult<string | undefined>(
+                async () => vscode.window.activeTextEditor?.document.getText(),
+                10000,
+                100,
+                (input) => {
+                    expect(input).toBe(expectedLines.join(EOL));
+                }
+            );
+        } finally {
+            // Restore original settings
+            await globalConfig.update('detectIndentation', true, vscode.ConfigurationTarget.Global);
+            await globalConfig.update('tabSize', originalGlobalTabSize, vscode.ConfigurationTarget.Global);
+            await csharpConfig.update('tabSize', originalCsharpTabSize, vscode.ConfigurationTarget.Global);
+        }
+    });
 });
 
 function normalizeNewlines(text: string | undefined): string | undefined {