assistant2: Highlight crease on selection (#24358)

Give the inline file crease inside of `assistant2`'s editor a
selection background when there is a selection over it

Release Notes:

- N/A

---------

Co-authored-by: Piotr <piotr@zed.dev>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/editor/src/display_map/fold_map.rs

@@ -2,7 +2,7 @@ use super::{
     inlay_map::{InlayBufferRows, InlayChunks, InlayEdit, InlayOffset, InlayPoint, InlaySnapshot},
     Highlights,
 };
-use gpui::{AnyElement, App, ElementId, Window};
+use gpui::{AnyElement, App, ElementId};
 use language::{Chunk, ChunkRenderer, Edit, Point, TextSummary};
 use multi_buffer::{
     Anchor, AnchorRangeExt, MultiBufferRow, MultiBufferSnapshot, RowInfo, ToOffset,
@@ -21,8 +21,7 @@ use util::post_inc;
 #[derive(Clone)]
 pub struct FoldPlaceholder {
     /// Creates an element to represent this fold's placeholder.
-    pub render:
-        Arc<dyn Send + Sync + Fn(FoldId, Range<Anchor>, &mut Window, &mut App) -> AnyElement>,
+    pub render: Arc<dyn Send + Sync + Fn(FoldId, Range<Anchor>, &mut App) -> AnyElement>,
     /// If true, the element is constrained to the shaped width of an ellipsis.
     pub constrain_width: bool,
     /// If true, merges the fold with an adjacent one.
@@ -34,7 +33,7 @@ pub struct FoldPlaceholder {
 impl Default for FoldPlaceholder {
     fn default() -> Self {
         Self {
-            render: Arc::new(|_, _, _, _| gpui::Empty.into_any_element()),
+            render: Arc::new(|_, _, _| gpui::Empty.into_any_element()),
             constrain_width: true,
             merge_adjacent: true,
             type_tag: None,
@@ -46,7 +45,7 @@ impl FoldPlaceholder {
     #[cfg(any(test, feature = "test-support"))]
     pub fn test() -> Self {
         Self {
-            render: Arc::new(|_id, _range, _window, _cx| gpui::Empty.into_any_element()),
+            render: Arc::new(|_id, _range, _cx| gpui::Empty.into_any_element()),
             constrain_width: true,
             merge_adjacent: true,
             type_tag: None,
@@ -486,7 +485,6 @@ impl FoldMap {
                                             (fold.placeholder.render)(
                                                 fold_id,
                                                 fold.range.0.clone(),
-                                                cx.window,
                                                 cx.context,
                                             )
                                         }),