editor: Fix Follow Agent unexpectedly stopping during edits (#35845)

Closes #34881

For horizontal scroll, we weren't keeping track of the `local` bool, so
whenever the agent tries to autoscroll horizontally, it would be seen as
a user scroll event resulting in unfollow.

Release Notes:

- Fixed an issue where the Follow Agent could unexpectedly stop
following during edits.

crates/editor/src/scroll.rs

@@ -348,8 +348,8 @@ impl ScrollManager {
         self.show_scrollbars
     }
 
-    pub fn autoscroll_request(&self) -> Option<Autoscroll> {
-        self.autoscroll_request.map(|(autoscroll, _)| autoscroll)
+    pub fn take_autoscroll_request(&mut self) -> Option<(Autoscroll, bool)> {
+        self.autoscroll_request.take()
     }
 
     pub fn active_scrollbar_state(&self) -> Option<&ActiveScrollbarState> {