Fixes #8952: When matching endLineNumber, find the outermost indent range

src/vs/editor/common/model/textModel.ts

@@ -509,7 +509,10 @@ export class TextModel extends OrderGuaranteeEventEmitter implements editorCommo
 				return 1 + Math.floor(rng.indent / this._options.tabSize);
 			}
 			if (rng.endLineNumber + 1 === lineNumber) {
-				return  Math.ceil(rng.indent / this._options.tabSize);
+				if (i === 0 || indentRanges[i - 1].endLineNumber + 1 !== lineNumber) {
+					// For endLineNumber matches, we need to find the outermost indent range
+					return  Math.ceil(rng.indent / this._options.tabSize);
+				}
 			}
 		}
 

src/vs/editor/test/common/model/textModel.test.ts

@@ -599,7 +599,7 @@ suite('TextModel.getLineIndentGuide', () => {
 			[1, '  A'],
 			[1, '    A'],
 			[2, '      A'],
-			[1, 'A'],
+			[0, 'A'],
 		]);
 	});
 
@@ -697,4 +697,15 @@ suite('TextModel.getLineIndentGuide', () => {
 			[1, '\tindent1'],
 		]);
 	});
+
+	test('issue #8952 - Indentation guide lines going through text on .yml file', () => {
+		assertIndentGuides([
+			[0, 'properties:'],
+			[1, '    emailAddress:'],
+			[2, '        - bla'],
+			[2, '        - length:'],
+			[3, '            max: 255'],
+			[0, 'getters:'],
+		]);
+	});
 });