Use consistent ordering for popup menus (#27765)

Before this change, the editor completion menu and gutter menus reversed their order so that the initial selection is near the user's focus.  This change instead displays these menus in a consistent top-to-bottom order because the following benefits outweigh that benefit:

* Matches behavior of some other editors (Neovim and VSCode).
* Looks better for lexicographic lists.
* Keeps the meaning of keyboard interaction consistent, if the user is anticipating the order of the menu's contents.

Could consider making this configurable in the future if desired.

Closes #25066.

Release Notes:

- N/A

crates/editor/src/element.rs

@@ -3351,7 +3351,7 @@ impl EditorElement {
                         height - height_above_menu
                     };
                     let mut element = self
-                        .render_context_menu(line_height, menu_height, y_flipped, window, cx)
+                        .render_context_menu(line_height, menu_height, window, cx)
                         .expect("Visible context menu should always render.");
                     let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);
                     Some((CursorPopoverType::CodeContextMenu, element, size))
@@ -3508,9 +3508,9 @@ impl EditorElement {
             viewport_bounds,
             window,
             cx,
-            move |height, _max_width_for_stable_x, y_flipped, window, cx| {
+            move |height, _max_width_for_stable_x, _, window, cx| {
                 let mut element = self
-                    .render_context_menu(line_height, height, y_flipped, window, cx)
+                    .render_context_menu(line_height, height, window, cx)
                     .expect("Visible context menu should always render.");
                 let size = element.layout_as_root(AvailableSpace::min_size(), window, cx);
                 vec![(CursorPopoverType::CodeContextMenu, element, size)]
@@ -3740,13 +3740,12 @@ impl EditorElement {
         &self,
         line_height: Pixels,
         height: Pixels,
-        y_flipped: bool,
         window: &mut Window,
         cx: &mut App,
     ) -> Option<AnyElement> {
         let max_height_in_lines = ((height - POPOVER_Y_PADDING) / line_height).floor() as u32;
         self.editor.update(cx, |editor, cx| {
-            editor.render_context_menu(&self.style, max_height_in_lines, y_flipped, window, cx)
+            editor.render_context_menu(&self.style, max_height_in_lines, window, cx)
         })
     }