Fixes #35673: Comment hotkeys throws the cursor before the comment

src/vs/editor/contrib/comment/common/lineCommentCommand.ts

@@ -200,8 +200,16 @@ export class LineCommentCommand implements editorCommon.ICommand {
 			ops = LineCommentCommand._createAddLineCommentsOperations(data.lines, s.startLineNumber);
 		}
 
+		const cursorPosition = new Position(s.positionLineNumber, s.positionColumn);
+
 		for (var i = 0, len = ops.length; i < len; i++) {
 			builder.addEditOperation(ops[i].range, ops[i].text);
+			if (ops[i].range.isEmpty() && ops[i].range.getStartPosition().equals(cursorPosition)) {
+				const lineContent = model.getLineContent(cursorPosition.lineNumber);
+				if (lineContent.length + 1 === cursorPosition.column) {
+					this._deltaColumn = ops[i].text.length;
+				}
+			}
 		}
 
 		this._selectionId = builder.trackSelection(s);

src/vs/editor/contrib/comment/test/common/lineCommentCommand.test.ts

@@ -518,6 +518,50 @@ suite('Editor Contrib - Line Comment Command', () => {
 		);
 	});
 
+	test('issue #35673: Comment hotkeys throws the cursor before the comment', () => {
+		testLineCommentCommand(
+			[
+				'first',
+				'',
+				'\tsecond line',
+				'third line',
+				'fourth line',
+				'fifth'
+			],
+			new Selection(2, 1, 2, 1),
+			[
+				'first',
+				'!@# ',
+				'\tsecond line',
+				'third line',
+				'fourth line',
+				'fifth'
+			],
+			new Selection(2, 5, 2, 5)
+		);
+
+		testLineCommentCommand(
+			[
+				'first',
+				'\t',
+				'\tsecond line',
+				'third line',
+				'fourth line',
+				'fifth'
+			],
+			new Selection(2, 2, 2, 2),
+			[
+				'first',
+				'\t!@# ',
+				'\tsecond line',
+				'third line',
+				'fourth line',
+				'fifth'
+			],
+			new Selection(2, 6, 2, 6)
+		);
+	});
+
 	test('issue #2837 "Add Line Comment" fault when blank lines involved', function () {
 		testAddLineCommentCommand(
 			[