[Bugfix] #4863: macOS 上错误的 Modrinth 整合包默认文件名称 (#4864)

Fixes #4863

Author: Calboot

HMCL/src/main/java/org/jackhuang/hmcl/ui/export/ModpackInfoPage.java

@@ -45,6 +45,7 @@
 import org.jackhuang.hmcl.util.StringUtils;
 import org.jackhuang.hmcl.util.io.FileUtils;
 import org.jackhuang.hmcl.util.io.JarUtils;
+import org.jackhuang.hmcl.util.platform.OperatingSystem;
 import org.jackhuang.hmcl.util.platform.SystemInfo;
 
 import java.nio.file.Path;
@@ -108,9 +109,9 @@ public ModpackInfoPage(WizardController controller, HMCLGameRepository gameRepos
     private void onNext() {
         FileChooser fileChooser = new FileChooser();
         fileChooser.setTitle(i18n("modpack.wizard.step.initialization.save"));
-        if (controller.getSettings().get(MODPACK_TYPE) == ModpackTypeSelectionPage.MODPACK_TYPE_MODRINTH) {
+        if (controller.getSettings().get(MODPACK_TYPE) == MODPACK_TYPE_MODRINTH) {
             fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter(i18n("modpack"), "*.mrpack"));
-            fileChooser.setInitialFileName(name.get() + ".mrpack");
+            fileChooser.setInitialFileName(name.get() + (OperatingSystem.CURRENT_OS == OperatingSystem.MACOS ? "" : ".mrpack"));
         } else {
             fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter(i18n("modpack"), "*.zip"));
             fileChooser.setInitialFileName(name.get() + ".zip");