[pyupgrade]: Improve diagnostic range for redundant-open-mode (UP015)

Author: MichaReiser

crates/ruff_linter/src/rules/pyupgrade/mod.rs

@@ -119,25 +119,6 @@ mod tests {
         Ok(())
     }
 
-    #[test_case(Rule::RedundantOpenModes, Path::new("UP015.py"))]
-    #[test_case(Rule::RedundantOpenModes, Path::new("UP015_1.py"))]
-    fn preview_rules(rule_code: Rule, path: &Path) -> Result<()> {
-        let snapshot = format!(
-            "preview__{}_{}",
-            rule_code.noqa_code(),
-            path.to_string_lossy()
-        );
-        let diagnostics = test_path(
-            Path::new("pyupgrade").join(path).as_path(),
-            &settings::LinterSettings {
-                preview: PreviewMode::Enabled,
-                ..settings::LinterSettings::for_rule(rule_code)
-            },
-        )?;
-        assert_messages!(snapshot, diagnostics);
-        Ok(())
-    }
-
     #[test]
     fn up007_preview() -> Result<()> {
         let diagnostics = test_path(

crates/ruff_linter/src/rules/pyupgrade/rules/redundant_open_modes.rs

@@ -91,17 +91,11 @@ fn create_diagnostic(
     mode: OpenMode,
     checker: &Checker,
 ) -> Diagnostic {
-    let range = if checker.settings.preview.is_enabled() {
-        mode_arg.range()
-    } else {
-        call.range
-    };
-
     let mut diagnostic = Diagnostic::new(
         RedundantOpenModes {
             replacement: mode.to_string(),
         },
-        range,
+        mode_arg.range(),
     );
 
     if mode.is_empty() {