fix(material/datepicker): manually trigger change detect only if keyboard event is not trusted

Author: zarend

src/material/datepicker/month-view.ts

@@ -340,8 +340,10 @@ export class MatMonthView<D> implements AfterContentInit, OnChanges, OnDestroy {
       this.activeDateChange.emit(this.activeDate);
     }
 
-    // Ensure the calendar body has the correct active cell.
-    this._changeDetectorRef.detectChanges();
+    if (!event.isTrusted) {
+      // Manually triggered events in unit tests do not trigger change detection. Ensures that the calendar body focuses on the date that is assigned to `this.activeDate` in this method.
+      this._changeDetectorRef.detectChanges();
+    }
 
     this._focusActiveCell();
     // Prevent unexpected default actions such as form submission.