edit prediction: Refine the stealth mode (#25599)

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>

crates/editor/src/scroll.rs

@@ -3,7 +3,6 @@ pub(crate) mod autoscroll;
 pub(crate) mod scroll_amount;
 
 use crate::editor_settings::{ScrollBeyondLastLine, ScrollbarAxes};
-use crate::EditPredictionPreview;
 use crate::{
     display_map::{DisplaySnapshot, ToDisplayPoint},
     hover_popover::hide_hover,
@@ -496,14 +495,8 @@ impl Editor {
         hide_hover(self, cx);
         let workspace_id = self.workspace.as_ref().and_then(|workspace| workspace.1);
 
-        if let EditPredictionPreview::Active {
-            previous_scroll_position,
-        } = &mut self.edit_prediction_preview
-        {
-            if !autoscroll {
-                previous_scroll_position.take();
-            }
-        }
+        self.edit_prediction_preview
+            .set_previous_scroll_position(None);
 
         self.scroll_manager.set_scroll_position(
             scroll_position,