Unify selection directions when performing editor: select all selections (#23993)

Closes https://github.com/zed-industries/zed/issues/19569

Current behavior:


https://github.com/user-attachments/assets/1de764c9-7c62-49ad-b24b-6e85760857db

After PR:


https://github.com/user-attachments/assets/651d8e50-95e2-4513-852b-9557d00d2b62

Release Notes:

- Unified selection directions when performing `editor: select all
selections`.

---------

Co-authored-by: Marshall Bowers <git@maxdeviant.com>

crates/editor/src/editor.rs

@@ -8827,6 +8827,12 @@ impl Editor {
             }
         }
 
+        let reversed = self.selections.oldest::<usize>(cx).reversed;
+
+        for selection in new_selections.iter_mut() {
+            selection.reversed = reversed;
+        }
+
         select_next_state.done = true;
         self.unfold_ranges(
             &new_selections