fix: 修复删除正在下载的任务时，被删除的任务重启后有概率又出现的问题

src-tauri/src/downloader/download_progress.rs

@@ -297,15 +297,19 @@ impl DownloadProgress {
         }
     }
 
-    pub fn save(&self, app: &AppHandle) -> anyhow::Result<()> {
+    pub fn save(&self, app: &AppHandle, allow_create: bool) -> anyhow::Result<()> {
         let progress = self.clone();
         let file_name = format!("{}.json", progress.task_id);
 
         let app_data_dir = app.path().app_data_dir()?;
-        let task_dir = app_data_dir.join(".下载任务");
-        std::fs::create_dir_all(&task_dir)?;
+        let tasks_dir = app_data_dir.join(".下载任务");
+        std::fs::create_dir_all(&tasks_dir)?;
+
+        let save_path = tasks_dir.join(file_name);
+        if !allow_create && !save_path.exists() {
+            return Ok(());
+        }
 
-        let save_path = task_dir.join(file_name);
         let progress_json = serde_json::to_string(&progress)?;
         std::fs::write(save_path, progress_json)?;
 

src-tauri/src/downloader/download_task.rs

@@ -103,7 +103,7 @@ impl DownloadTask {
 
         let mut tasks = Vec::new();
         for progress in progresses {
-            if let Err(err) = progress.save(app) {
+            if let Err(err) = progress.save(app, true) {
                 let ids_string = progress.get_ids_string();
                 let episode_title = &progress.episode_title;
                 let err_title = format!("{ids_string} `{episode_title}`保存下载进度到文件失败");
@@ -1032,7 +1032,7 @@ impl DownloadTask {
         }
         .emit(&self.app);
 
-        if let Err(err) = updated_progress.save(&self.app) {
+        if let Err(err) = updated_progress.save(&self.app, false) {
             let ids_string = updated_progress.get_ids_string();
             let episode_title = &updated_progress.episode_title;
             let err_title = format!("{ids_string} `{episode_title}`保存下载进度到文件失败");