Stop inlining methods in a combinator

Fixes https://github.com/dart-lang/sdk/issues/28253

Change-Id: I186f36c107b11dcfdefb2aa56420b607e80aa69e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/434021
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
Reviewed-by: Samuel Rawlins <srawlins@google.com>

pkg/analysis_server/lib/src/services/refactoring/legacy/inline_method.dart

@@ -416,7 +416,8 @@ class InlineMethodRefactoringImpl extends RefactoringImpl
     } else if (selectedNode is MethodDeclaration) {
       element = selectedNode.declaredFragment?.element;
       isDeclaration = true;
-    } else if (selectedNode is SimpleIdentifier) {
+    } else if (selectedNode is SimpleIdentifier &&
+        selectedNode.parent is! Combinator) {
       element = selectedNode.writeOrReadElement2;
     } else {
       return fatalStatus;

pkg/analysis_server/test/services/refactoring/legacy/inline_method_test.dart

@@ -243,6 +243,24 @@ void f() {
     );
   }
 
+  Future<void> test_bad_inShowCombinator() async {
+    newFile('$testPackageLibPath/a.dart', '''
+void f() {
+  print(42);
+}
+''');
+    await indexTestUnit(r'''
+import 'a.dart' show f;
+
+void g() {
+  f();
+}
+''');
+    _createRefactoring('f;');
+    // error
+    return _assertInvalidSelection();
+  }
+
   Future<void> test_bad_notExecutableElement() async {
     await indexTestUnit(r'''
 void f() {