Fix #3456 在更新预览界面没法拖动启动器窗口 (#3464)

HMCL/src/main/java/org/jackhuang/hmcl/ui/UpgradeDialog.java

@@ -41,6 +41,9 @@ import static org.jackhuang.hmcl.util.logging.Logger.LOG;
 
 public final class UpgradeDialog extends JFXDialogLayout {
     public UpgradeDialog(RemoteVersion remoteVersion, Runnable updateRunnable) {
+        maxWidthProperty().bind(Controllers.getScene().widthProperty().multiply(0.7));
+        maxHeightProperty().bind(Controllers.getScene().heightProperty().multiply(0.7));
+
         setHeading(new Label(i18n("update.changelog")));
         setBody(new ProgressIndicator());