Do not show diffs for files with \r\n contents (#11519)

crates/editor/src/test/editor_test_context.rs

@@ -21,7 +21,6 @@ use std::{
         Arc,
     },
 };
-use text::Rope;
 use ui::Context;
 use util::{
     assert_set_eq,
@@ -272,8 +271,7 @@ impl EditorTestContext {
     }
 
     pub fn set_diff_base(&mut self, diff_base: Option<&str>) {
-        let diff_base = diff_base.map(Rope::from);
-        self.update_buffer(|buffer, cx| buffer.set_diff_base(diff_base, cx));
+        self.update_buffer(|buffer, cx| buffer.set_diff_base(diff_base.map(ToOwned::to_owned), cx));
     }
 
     /// Change the editor's text and selections using a string containing