Desktop: Make shutdown more robust and fix panic caused by invalid viewport scale (#3783)

* Fix panic caused by invalid viewport scale

* Make shutdown more robust

frontend/src/utility-functions/viewports.ts

@@ -42,6 +42,10 @@ export function setupViewportResizeObserver(editor: Editor) {
 			// TODO: Consider passing physical sizes as well to eliminate pixel inaccuracies since width and height could be rounded differently
 			const scale = physicalWidth / logicalWidth;
 
+			if (!scale || scale <= 0) {
+				continue;
+			}
+
 			editor.handle.updateViewport(bounds.x, bounds.y, logicalWidth, logicalHeight, scale);
 		}
 	});