Bug 1745131 - Avoid implicit fallthrough in cocoa widget code. r=spohl

Differential Revision: https://phabricator.services.mozilla.com/D133332

widget/cocoa/nsChildView.mm

@@ -4344,6 +4344,7 @@ static gfx::IntPoint GetIntegerDeltaForEvent(NSEvent* aEvent) {
           nsCOMPtr<nsIDragService> dragService = mDragService;
           dragService->EndDragSession(false, nsCocoaUtils::ModifiersForEvent([NSApp currentEvent]));
         }
+        break;
       }
       default:
         break;

widget/cocoa/nsCocoaWindow.mm

@@ -928,8 +928,7 @@ void nsCocoaWindow::Show(bool bState) {
               behavior = NSWindowAnimationBehaviorDocumentWindow;
               break;
             default:
-              MOZ_ASSERT_UNREACHABLE("unexpected mAnimationType value");
-              // fall through
+              MOZ_FALLTHROUGH_ASSERT("unexpected mAnimationType value");
             case nsIWidget::eGenericWindowAnimation:
               behavior = NSWindowAnimationBehaviorDefault;
               break;

widget/cocoa/nsNativeThemeCocoa.mm

@@ -3307,6 +3307,7 @@ nsNativeThemeCocoa::GetMinimumWidgetSize(nsPresContext* aPresContext, nsIFrame*
       HIThemeGetGrowBoxBounds(&pnt, &drawInfo, &bounds);
       aResult->SizeTo(bounds.size.width, bounds.size.height);
       *aIsOverridable = false;
+      break;
     }
     default:
       break;