DirtyDiff - handle the diff in trigger instead of then (#233914)

Author: lszomoru

src/vs/workbench/contrib/scm/browser/dirtydiffDecorator.ts

@@ -1212,7 +1212,7 @@ export class DirtyDiffModel extends Disposable {
 	private _model: ITextFileEditorModel;
 	get original(): ITextModel[] { return this._originalTextModels; }
 
-	private diffDelayer = new ThrottledDelayer<{ changes: LabeledChange[]; mapChanges: Map<string, number[]> } | null>(200);
+	private diffDelayer = new ThrottledDelayer<void>(200);
 	private _quickDiffsPromise?: Promise<QuickDiff[]>;
 	private repositoryDisposables = new Set<IDisposable>();
 	private readonly originalModelDisposables = this._register(new DisposableStore());
@@ -1295,14 +1295,15 @@ export class DirtyDiffModel extends Disposable {
 		this.triggerDiff();
 	}
 
-	private triggerDiff(): Promise<void> {
+	private triggerDiff(): void {
 		if (!this.diffDelayer) {
-			return Promise.resolve();
+			return;
 		}
 
-		return this.diffDelayer
-			.trigger(() => this.diff())
-			.then((result: { changes: LabeledChange[]; mapChanges: Map<string, number[]> } | null) => {
+		this.diffDelayer
+			.trigger(async () => {
+				const result: { changes: LabeledChange[]; mapChanges: Map<string, number[]> } | null = await this.diff();
+
 				const originalModels = Array.from(this._originalModels.values());
 				if (!result || this._disposed || this._model.isDisposed() || originalModels.some(originalModel => originalModel.isDisposed())) {
 					return; // disposed
@@ -1317,7 +1318,8 @@ export class DirtyDiffModel extends Disposable {
 				}
 
 				this.setChanges(result.changes, result.mapChanges);
-			}, (err) => onUnexpectedError(err));
+			})
+			.catch(err => onUnexpectedError(err));
 	}
 
 	private setChanges(changes: LabeledChange[], mapChanges: Map<string, number[]>): void {