revert "only start with a timeline reset diff if the timeline isn't empty"

Author: ganfra

bindings/matrix-sdk-ffi/src/timeline/mod.rs

@@ -286,14 +286,7 @@ impl Timeline {
         // Note we pass initial items as a reset update, as a way to give the callers a
         // unified way to handle the initial batch of items as well as other
         // batches, instead of having a separate callback for the initial items.
-        //
-        // Start with passing all the items of a *non-empty* timeline as a reset update
-        // (if the initial items are empty, then the timeline would transition
-        // from empty to empty, which is a no-op).
-        if !timeline_items.is_empty() {
-            listener
-                .on_update(vec![TimelineDiff::new(VectorDiff::Reset { values: timeline_items })]);
-        }
+        listener.on_update(vec![TimelineDiff::new(VectorDiff::Reset { values: timeline_items })]);
 
         Arc::new(TaskHandle::new(get_runtime_handle().spawn(async move {
             pin_mut!(timeline_stream);