Fixes #77332: Increase first line limit for mode detaction from 100 to 1000

src/vs/editor/common/model.ts

@@ -1192,6 +1192,13 @@ export interface ITextBufferFactory {
 	getFirstLineText(lengthLimit: number): string;
 }
 
+/**
+ * @internal
+ */
+export const enum ModelConstants {
+	FIRST_LINE_DETECTION_LENGTH_LIMIT = 1000
+}
+
 /**
  * @internal
  */

src/vs/editor/common/model/pieceTreeTextBuffer/pieceTreeTextBufferBuilder.ts

@@ -57,7 +57,7 @@ export class PieceTreeTextBufferFactory implements ITextBufferFactory {
 	}
 
 	public getFirstLineText(lengthLimit: number): string {
-		return this._chunks[0].buffer.substr(0, 100).split(/\r\n|\r|\n/)[0];
+		return this._chunks[0].buffer.substr(0, lengthLimit).split(/\r\n|\r|\n/)[0];
 	}
 }
 

src/vs/workbench/common/editor/textEditorModel.ts

@@ -3,7 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { ITextModel, ITextBufferFactory, ITextSnapshot } from 'vs/editor/common/model';
+import { ITextModel, ITextBufferFactory, ITextSnapshot, ModelConstants } from 'vs/editor/common/model';
 import { EditorModel, IModeSupport } from 'vs/workbench/common/editor';
 import { URI } from 'vs/base/common/uri';
 import { ITextEditorModel, IResolvedTextEditorModel } from 'vs/editor/common/services/resolverService';
@@ -106,12 +106,12 @@ export abstract class BaseTextEditorModel extends EditorModel implements ITextEd
 		// text buffer factory
 		const textBufferFactory = value as ITextBufferFactory;
 		if (typeof textBufferFactory.getFirstLineText === 'function') {
-			return textBufferFactory.getFirstLineText(100);
+			return textBufferFactory.getFirstLineText(ModelConstants.FIRST_LINE_DETECTION_LENGTH_LIMIT);
 		}
 
 		// text model
 		const textSnapshot = value as ITextModel;
-		return textSnapshot.getLineContent(1).substr(0, 100);
+		return textSnapshot.getLineContent(1).substr(0, ModelConstants.FIRST_LINE_DETECTION_LENGTH_LIMIT);
 	}
 
 	/**