fix(task): wrong cancellation implementation. Closes #1035.

HMCL/src/main/java/org/jackhuang/hmcl/ui/download/DownloadPage.java

@@ -57,6 +57,7 @@ import org.jetbrains.annotations.Nullable;
 import java.nio.file.Path;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.CancellationException;
 
 import static org.jackhuang.hmcl.ui.FXUtils.runInFX;
 import static org.jackhuang.hmcl.ui.versions.VersionPage.wrap;
@@ -166,9 +167,13 @@ public class DownloadPage extends BorderPane implements DecoratorPage {
             FileDownloadTask task = new FileDownloadTask(NetworkUtils.toURL(file.getFile().getUrl()), dest.toFile());
             task.setName(file.getName());
             return task;
-        }).whenComplete(exception -> {
+        }).whenComplete(Schedulers.javafx(), exception -> {
             if (exception != null) {
-                Controllers.dialog(DownloadProviders.localizeErrorMessage(exception), i18n("install.failed.downloading"), MessageDialogPane.MessageType.ERROR);
+                if (exception instanceof CancellationException) {
+                    Controllers.showToast(i18n("message.cancelled"));
+                } else {
+                    Controllers.dialog(DownloadProviders.localizeErrorMessage(exception), i18n("install.failed.downloading"), MessageDialogPane.MessageType.ERROR);
+                }
             } else {
                 Controllers.showToast(i18n("install.success"));
             }

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -420,6 +420,7 @@ logwindow.export_game_crash_logs=Export game crash info
 
 main_page=Home
 
+message.cancelled=Operation was cancelled
 message.confirm=Confirm
 message.copied=Copied to clipboard
 message.doing=Please wait

HMCL/src/main/resources/assets/lang/I18N_zh.properties

@@ -420,6 +420,7 @@ logwindow.export_game_crash_logs=導出遊戲崩潰訊息
 
 main_page=首頁
 
+message.cancelled=操作被取消
 message.confirm=提示
 message.copied=已複製到剪貼板
 message.doing=請耐心等待

HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties

@@ -420,6 +420,7 @@ logwindow.export_game_crash_logs=导出游戏崩溃信息
 
 main_page=主页
 
+message.cancelled=操作被取消
 message.confirm=提示
 message.copied=已复制到剪贴板
 message.doing=请耐心等待