Stabilize fixes for RET50{5-8} (#12840)

Fixes #10099

Author: MichaReiser

crates/ruff_linter/resources/test/fixtures/flake8_return/RET505.py

@@ -244,3 +244,11 @@ def f():
 	 return True
 	else:
 	 return False
+
+
+def has_untracted_files():
+    if b'Untracked files' in result.stdout:
+        return True
+    else:
+\
+        return False

crates/ruff_linter/src/fix/edits.rs

@@ -317,26 +317,28 @@ pub(crate) fn adjust_indentation(
         line_indentation.contains('\t') && line_indentation.contains(' ')
     });
 
-    if contains_multiline_string || mixed_indentation {
-        let module_text = format!("def f():{}{contents}", stylist.line_ending().as_str());
+    // For simple cases, try to do a manual dedent.
+    if !contains_multiline_string && !mixed_indentation {
+        if let Some(dedent) = dedent_to(contents, indentation) {
+            return Ok(dedent);
+        }
+    }
 
-        let mut tree = match_statement(&module_text)?;
+    let module_text = format!("def f():{}{contents}", stylist.line_ending().as_str());
 
-        let embedding = match_function_def(&mut tree)?;
+    let mut tree = match_statement(&module_text)?;
 
-        let indented_block = match_indented_block(&mut embedding.body)?;
-        indented_block.indent = Some(indentation);
+    let embedding = match_function_def(&mut tree)?;
 
-        let module_text = indented_block.codegen_stylist(stylist);
-        let module_text = module_text
-            .strip_prefix(stylist.line_ending().as_str())
-            .unwrap()
-            .to_string();
-        Ok(module_text)
-    } else {
-        // Otherwise, we can do a simple adjustment ourselves.
-        Ok(dedent_to(contents, indentation))
-    }
+    let indented_block = match_indented_block(&mut embedding.body)?;
+    indented_block.indent = Some(indentation);
+
+    let module_text = indented_block.codegen_stylist(stylist);
+    let module_text = module_text
+        .strip_prefix(stylist.line_ending().as_str())
+        .unwrap()
+        .to_string();
+    Ok(module_text)
 }
 
 /// Determine if a vector contains only one, specific element.

crates/ruff_linter/src/rules/flake8_return/mod.rs

@@ -36,10 +36,6 @@ mod tests {
     }
 
     #[test_case(Rule::ImplicitReturn, Path::new("RET503.py"))]
-    #[test_case(Rule::SuperfluousElseReturn, Path::new("RET505.py"))]
-    #[test_case(Rule::SuperfluousElseRaise, Path::new("RET506.py"))]
-    #[test_case(Rule::SuperfluousElseContinue, Path::new("RET507.py"))]
-    #[test_case(Rule::SuperfluousElseBreak, Path::new("RET508.py"))]
     fn preview_rules(rule_code: Rule, path: &Path) -> Result<()> {
         let snapshot = format!(
             "preview__{}_{}",

crates/ruff_linter/src/rules/flake8_return/rules/function.rs

@@ -672,16 +672,14 @@ fn superfluous_else_node(
                     .unwrap_or_else(|| elif_else.range()),
             );
             if checker.enabled(diagnostic.kind.rule()) {
-                if checker.settings.preview.is_enabled() {
-                    diagnostic.try_set_fix(|| {
-                        remove_else(
-                            elif_else,
-                            checker.locator(),
-                            checker.indexer(),
-                            checker.stylist(),
-                        )
-                    });
-                }
+                diagnostic.try_set_fix(|| {
+                    remove_else(
+                        elif_else,
+                        checker.locator(),
+                        checker.indexer(),
+                        checker.stylist(),
+                    )
+                });
                 checker.diagnostics.push(diagnostic);
             }
             return true;
@@ -692,16 +690,15 @@ fn superfluous_else_node(
                     .unwrap_or_else(|| elif_else.range()),
             );
             if checker.enabled(diagnostic.kind.rule()) {
-                if checker.settings.preview.is_enabled() {
-                    diagnostic.try_set_fix(|| {
-                        remove_else(
-                            elif_else,
-                            checker.locator(),
-                            checker.indexer(),
-                            checker.stylist(),
-                        )
-                    });
-                }
+                diagnostic.try_set_fix(|| {
+                    remove_else(
+                        elif_else,
+                        checker.locator(),
+                        checker.indexer(),
+                        checker.stylist(),
+                    )
+                });
+
                 checker.diagnostics.push(diagnostic);
             }
             return true;
@@ -712,16 +709,15 @@ fn superfluous_else_node(
                     .unwrap_or_else(|| elif_else.range()),
             );
             if checker.enabled(diagnostic.kind.rule()) {
-                if checker.settings.preview.is_enabled() {
-                    diagnostic.try_set_fix(|| {
-                        remove_else(
-                            elif_else,
-                            checker.locator(),
-                            checker.indexer(),
-                            checker.stylist(),
-                        )
-                    });
-                }
+                diagnostic.try_set_fix(|| {
+                    remove_else(
+                        elif_else,
+                        checker.locator(),
+                        checker.indexer(),
+                        checker.stylist(),
+                    )
+                });
+
                 checker.diagnostics.push(diagnostic);
             }
             return true;
@@ -732,16 +728,15 @@ fn superfluous_else_node(
                     .unwrap_or_else(|| elif_else.range()),
             );
             if checker.enabled(diagnostic.kind.rule()) {
-                if checker.settings.preview.is_enabled() {
-                    diagnostic.try_set_fix(|| {
-                        remove_else(
-                            elif_else,
-                            checker.locator(),
-                            checker.indexer(),
-                            checker.stylist(),
-                        )
-                    });
-                }
+                diagnostic.try_set_fix(|| {
+                    remove_else(
+                        elif_else,
+                        checker.locator(),
+                        checker.indexer(),
+                        checker.stylist(),
+                    )
+                });
+
                 checker.diagnostics.push(diagnostic);
             }
             return true;