Fix chat scrolling up after sending message

src/ui/chat.rs

@@ -124,6 +124,7 @@ impl<M: Msg, S: MsgStore<M>> ChatState<M, S> {
     /// A [`Reaction::Composed`] message was sent successfully.
     pub fn send_successful(&mut self, id: M::Id) {
         if let Cursor::Pseudo { .. } = &self.cursor {
+            self.tree.send_successful(&id);
             self.cursor = Cursor::Msg(id);
             self.editor.clear();
         }

src/ui/chat/tree.rs

@@ -405,6 +405,12 @@ impl<M: Msg, S: MsgStore<M>> TreeViewState<M, S> {
         })
     }
 
+    pub fn send_successful(&mut self, id: &M::Id) {
+        if let Cursor::Pseudo { .. } = self.last_cursor {
+            self.last_cursor = Cursor::Msg(id.clone());
+        }
+    }
+
     pub fn widget<'a>(
         &'a mut self,
         cursor: &'a mut Cursor<M::Id>,