another fix for #15941

src/vs/workbench/browser/parts/editor/editor.contribution.ts

@@ -97,9 +97,13 @@ class UntitledEditorInputFactory implements IEditorInputFactory {
 
 	public serialize(editorInput: EditorInput): string {
 		const untitledEditorInput = <UntitledEditorInput>editorInput;
-		const serialized: ISerializedUntitledEditorInput = {
-			resource: untitledEditorInput.getResource().toString()
-		};
+
+		let resource = untitledEditorInput.getResource();
+		if (untitledEditorInput.hasAssociatedFilePath) {
+			resource = URI.file(resource.fsPath); // untitled with associated file path use the file schema
+		}
+
+		const serialized: ISerializedUntitledEditorInput = { resource: resource.toString() };
 
 		return JSON.stringify(serialized);
 	}

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

@@ -28,7 +28,7 @@ export class UntitledEditorInput extends AbstractUntitledEditorInput {
 	public static SCHEMA: string = 'untitled';
 
 	private resource: URI;
-	private hasAssociatedFilePath: boolean;
+	private _hasAssociatedFilePath: boolean;
 	private modeId: string;
 	private cachedModel: UntitledEditorModel;
 
@@ -49,13 +49,17 @@ export class UntitledEditorInput extends AbstractUntitledEditorInput {
 		super();
 
 		this.resource = resource;
-		this.hasAssociatedFilePath = hasAssociatedFilePath;
+		this._hasAssociatedFilePath = hasAssociatedFilePath;
 		this.modeId = modeId;
 		this.toUnbind = [];
 		this._onDidModelChangeContent = new Emitter<void>();
 		this._onDidModelChangeEncoding = new Emitter<void>();
 	}
 
+	public get hasAssociatedFilePath(): boolean {
+		return this._hasAssociatedFilePath;
+	}
+
 	public get onDidModelChangeContent(): Event<void> {
 		return this._onDidModelChangeContent.event;
 	}

src/vs/workbench/services/untitled/common/untitledEditorService.ts

@@ -180,7 +180,7 @@ export class UntitledEditorService implements IUntitledEditorService {
 			// Create new taking a resource URI that is not already taken
 			let counter = Object.keys(UntitledEditorService.CACHE).length + 1;
 			do {
-				resource = URI.from({ scheme: UntitledEditorInput.SCHEMA, path: 'Untitled-' + counter });
+				resource = URI.from({ scheme: UntitledEditorInput.SCHEMA, path: `Untitled-${counter}` });
 				counter++;
 			} while (Object.keys(UntitledEditorService.CACHE).indexOf(resource.toString()) >= 0);
 		}