Extract a TextBuffer from Buffer, which has no tree or file

Co-Authored-By: Antonio Scandurra <me@as-cii.com>
Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/buffer/src/tests/syntax.rs

@@ -351,6 +351,19 @@ fn test_contiguous_ranges() {
     );
 }
 
+impl Buffer {
+    pub fn enclosing_bracket_point_ranges<T: ToOffset>(
+        &self,
+        range: Range<T>,
+    ) -> Option<(Range<Point>, Range<Point>)> {
+        self.enclosing_bracket_ranges(range).map(|(start, end)| {
+            let point_start = start.start.to_point(self)..start.end.to_point(self);
+            let point_end = end.start.to_point(self)..end.end.to_point(self);
+            (point_start, point_end)
+        })
+    }
+}
+
 fn rust_lang() -> Arc<Language> {
     Arc::new(
         Language::new(

crates/editor/src/display_map.rs

@@ -436,7 +436,7 @@ mod tests {
                     }
                 }
                 _ => {
-                    buffer.update(&mut cx, |buffer, cx| buffer.randomly_mutate(&mut rng, cx));
+                    buffer.update(&mut cx, |buffer, cx| buffer.randomly_edit(&mut rng, 5, cx));
                 }
             }