mobile: fix switching app from background to foreground starts

a new attachment cache download group

apps/mobile/app/hooks/use-app-events.tsx

@@ -561,6 +561,7 @@ export const useAppEvents = () => {
       initialUrl: string;
       backupDidWait: boolean;
       isConnectingSSE: boolean;
+      attachmentsCachedOfflineMode: boolean;
     }>
   >({});
 
@@ -655,7 +656,11 @@ export const useAppEvents = () => {
         }
       }
 
-      if (SettingsService.getProperty("offlineMode")) {
+      if (
+        SettingsService.getProperty("offlineMode") &&
+        !refValues.current.attachmentsCachedOfflineMode
+      ) {
+        refValues.current.attachmentsCachedOfflineMode = true;
         db.attachments.cacheAttachments().catch(() => {
           /* empty */
         });

packages/core/src/database/fs.ts

@@ -63,7 +63,16 @@ export class FileStorage {
     let current = 0;
     const token = await this.tokenManager.getAccessToken();
     const total = files.length;
-    const group = this.groups.downloads.get(groupId) || new Set();
+
+    if (this.groups.downloads.has(groupId)) {
+      logger.debug("[queueDownloads] group already exists", {
+        groupId
+      });
+      return this.groups.downloads.get(groupId);
+    }
+
+    const group = new Set<string>();
+
     files.forEach((f) => group.add(f.filename));
     this.groups.downloads.set(groupId, group);
 
@@ -143,7 +152,16 @@ export class FileStorage {
     let current = 0;
     const token = await this.tokenManager.getAccessToken();
     const total = files.length;
-    const group = this.groups.uploads.get(groupId) || new Set();
+
+    if (this.groups.uploads.has(groupId)) {
+      logger.debug("[queueUploads] group already exists", {
+        groupId
+      });
+      return this.groups.uploads.get(groupId);
+    }
+
+    const group = new Set<string>();
+
     files.forEach((f) => group.add(f.filename));
     this.groups.uploads.set(groupId, group);