Merge pull request #111897 from microsoft/alex/111128

Do not touch current line's indentation when pressing Enter

src/vs/editor/common/controller/cursorTypeOperations.ts

@@ -351,13 +351,6 @@ export class TypeOperations {
 			if (ir) {
 				let oldEndViewColumn = CursorColumns.visibleColumnFromColumn2(config, model, range.getEndPosition());
 				const oldEndColumn = range.endColumn;
-
-				let beforeText = '\n';
-				if (indentation !== config.normalizeIndentation(ir.beforeEnter)) {
-					beforeText = config.normalizeIndentation(ir.beforeEnter) + lineText.substring(indentation.length, range.startColumn - 1) + '\n';
-					range = new Range(range.startLineNumber, 1, range.endLineNumber, range.endColumn);
-				}
-
 				const newLineContent = model.getLineContent(range.endLineNumber);
 				const firstNonWhitespace = strings.firstNonWhitespaceIndex(newLineContent);
 				if (firstNonWhitespace >= 0) {
@@ -367,7 +360,7 @@ export class TypeOperations {
 				}
 
 				if (keepPosition) {
-					return new ReplaceCommandWithoutChangingPosition(range, beforeText + config.normalizeIndentation(ir.afterEnter), true);
+					return new ReplaceCommandWithoutChangingPosition(range, '\n' + config.normalizeIndentation(ir.afterEnter), true);
 				} else {
 					let offset = 0;
 					if (oldEndColumn <= firstNonWhitespace + 1) {
@@ -376,7 +369,7 @@ export class TypeOperations {
 						}
 						offset = Math.min(oldEndViewColumn + 1 - config.normalizeIndentation(ir.afterEnter).length - 1, 0);
 					}
-					return new ReplaceCommandWithOffsetCursorState(range, beforeText + config.normalizeIndentation(ir.afterEnter), 0, offset, true);
+					return new ReplaceCommandWithOffsetCursorState(range, '\n' + config.normalizeIndentation(ir.afterEnter), 0, offset, true);
 				}
 			}
 		}

src/vs/editor/test/browser/controller/cursor.test.ts

@@ -4169,6 +4169,18 @@ suite('Editor Controller - Indentation Rules', () => {
 		model.dispose();
 		mode.dispose();
 	});
+
+	test('issue #111128: Multicursor `Enter` issue with indentation', () => {
+		const model = createTextModel('    let a, b, c;', { detectIndentation: false, insertSpaces: false, tabSize: 4 }, mode.getLanguageIdentifier());
+		withTestCodeEditor(null, { model: model }, (editor, viewModel) => {
+			editor.setSelections([
+				new Selection(1, 11, 1, 11),
+				new Selection(1, 14, 1, 14),
+			]);
+			viewModel.type('\n', 'keyboard');
+			assert.equal(model.getValue(), '    let a,\n\t b,\n\t c;');
+		});
+	});
 });
 
 interface ICursorOpts {