Take a mutable context when resolving selections (#19948)

This is a behavior-preserving change, but lays the groundwork for
expanding selections when the cursor lands inside of a "replace" block.

Release Notes:

- N/A

crates/editor/src/linked_editing_ranges.rs

@@ -41,9 +41,9 @@ pub(super) fn refresh_linked_ranges(this: &mut Editor, cx: &mut ViewContext<Edit
         return None;
     }
     let project = this.project.clone()?;
+    let selections = this.selections.all::<usize>(cx);
     let buffer = this.buffer.read(cx);
     let mut applicable_selections = vec![];
-    let selections = this.selections.all::<usize>(cx);
     let snapshot = buffer.snapshot(cx);
     for selection in selections {
         let cursor_position = selection.head();