Fixes #51275: push stack element before move word commands

src/vs/editor/contrib/wordOperations/test/wordOperations.test.ts

@@ -11,6 +11,8 @@ import { Selection } from 'vs/editor/common/core/selection';
 import { deserializePipePositions, serializePipePositions, testRepeatedActionAndExtractPositions } from 'vs/editor/contrib/wordOperations/test/wordTestUtils';
 import { CursorWordEndLeft, CursorWordEndLeftSelect, CursorWordEndRight, CursorWordEndRightSelect, CursorWordLeft, CursorWordLeftSelect, CursorWordRight, CursorWordRightSelect, CursorWordStartLeft, CursorWordStartLeftSelect, CursorWordStartRight, CursorWordStartRightSelect, DeleteWordEndLeft, DeleteWordEndRight, DeleteWordLeft, DeleteWordRight, DeleteWordStartLeft, DeleteWordStartRight, CursorWordAccessibilityLeft, CursorWordAccessibilityLeftSelect, CursorWordAccessibilityRight, CursorWordAccessibilityRightSelect } from 'vs/editor/contrib/wordOperations/wordOperations';
 import { withTestCodeEditor } from 'vs/editor/test/browser/testCodeEditor';
+import { Handler } from 'vs/editor/common/editorCommon';
+import { Cursor } from 'vs/editor/common/controller/cursor';
 
 suite('WordOperations', () => {
 
@@ -193,6 +195,32 @@ suite('WordOperations', () => {
 		assert.deepEqual(actual, EXPECTED);
 	});
 
+	test('issue #51275 - cursorWordStartLeft does not push undo/redo stack element', () => {
+		function cursorCommand(cursor: Cursor, command: string, extraData?: any, overwriteSource?: string) {
+			cursor.trigger(overwriteSource || 'tests', command, extraData);
+		}
+
+		function type(cursor: Cursor, text: string) {
+			for (let i = 0; i < text.length; i++) {
+				cursorCommand(cursor, Handler.Type, { text: text.charAt(i) }, 'keyboard');
+			}
+		}
+
+		withTestCodeEditor('', {}, (editor, cursor) => {
+			type(cursor, 'foo bar baz');
+			assert.equal(editor.getValue(), 'foo bar baz');
+
+			cursorWordStartLeft(editor);
+			cursorWordStartLeft(editor);
+			type(cursor, 'q');
+
+			assert.equal(editor.getValue(), 'foo qbar baz');
+
+			cursorCommand(cursor, Handler.Undo, {});
+			assert.equal(editor.getValue(), 'foo bar baz');
+		});
+	});
+
 	test('cursorWordEndLeft', () => {
 		const EXPECTED = ['|   /*| Just| some|   more|   text| a|+=| 3| +|5|-|3| +| 7| */|  '].join('\n');
 		const [text,] = deserializePipePositions(EXPECTED);

src/vs/editor/contrib/wordOperations/wordOperations.ts

@@ -52,6 +52,7 @@ export abstract class MoveWordCommand extends EditorCommand {
 			return this._moveTo(sel, outPosition, this._inSelectionMode);
 		});
 
+		model.pushStackElement();
 		editor._getCursors().setStates('moveWordCommand', CursorChangeReason.NotSet, result.map(r => CursorState.fromModelSelection(r)));
 		if (result.length === 1) {
 			const pos = new Position(result[0].positionLineNumber, result[0].positionColumn);