Preserve content on deletion.

src/Collections/Main.tsx

@@ -53,7 +53,7 @@ export default function CollectionsMain() {
 
   async function onDelete(collection: Etebase.Collection) {
     const colMgr = getCollectionManager(etebase);
-    await collection.delete();
+    await collection.delete(true);
     await dispatch(collectionUpload(colMgr, collection));
 
     history.push(routeResolver.getRoute("collections"));

src/Pim/helpers.tsx

@@ -114,7 +114,7 @@ export async function itemDelete(etebase: Etebase.Account, collection: Etebase.C
   const meta = await eteItem.getMeta();
   meta.mtime = mtime;
   await eteItem.setMeta(meta);
-  await eteItem.delete();
+  await eteItem.delete(true);
 
   await asyncDispatch(itemBatch(collection, itemMgr, [eteItem]));
 }