Issue 23018. Fix for inlining multiline strings with leading whitespaces.

pkg/analysis_server/test/services/refactoring/inline_local_test.dart

Index: pkg/analysis_server/test/services/refactoring/inline_local_test.dart
diff --git a/pkg/analysis_server/test/services/refactoring/inline_local_test.dart b/pkg/analysis_server/test/services/refactoring/inline_local_test.dart
index 8e8b6aba3f563a837ce281fef8b23fe2d65e459e..1e646ffd2319a99dd1d3d92e6ae6c5664eeaadb0 100644
--- a/pkg/analysis_server/test/services/refactoring/inline_local_test.dart
+++ b/pkg/analysis_server/test/services/refactoring/inline_local_test.dart
@@ -257,6 +257,29 @@ main() {
 ''');
   }
 
+  test_OK_intoStringInterpolation_string_multiLineIntoMulti_leadingSpaces() {
+    indexTestUnit(r"""
+main() {
+  String a = '''\ \
+a
+a''';
+  String b = '''
+$a
+bbb''';
+}
+""");
+    _createRefactoring('a =');
+    // validate change
+    return assertSuccessfulRefactoring(r"""
+main() {
+  String b = '''
+a
+a
+bbb''';
+}
+""");
+  }
+
   test_OK_intoStringInterpolation_string_multiLineIntoMulti_unixEOL() {
     indexTestUnit(r"""
 main() {