fix: Non-ASCII test names being escaped when creating run configurations (#8838)

`StringUtil.escapeProperty()` was incorrectly applied to test names in
[`CommonTestConfigUtils.findTestName()`](https://github.com/flutter/flutter-intellij/blob/24d11f2a5b5165dc284df06e982a2b56892b632f/src/io/flutter/run/common/CommonTestConfigUtils.java#L139),
converting non-ASCII characters (e.g. Japanese "テスト") to Unicode escape
sequences. This caused `flutter test --plain-name` to receive an escaped
string that did not match the actual test name, preventing the test from
running.

Fix by removing the `escapeProperty()` call, which is intended for
`.properties` file encoding and is unnecessary here.

fixes #7985

---

- [x] I’ve reviewed the contributor guide and applied the relevant
portions to this PR.

<details>
  <summary>Contribution guidelines:</summary><br>

- See our [contributor
guide]([https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md](https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md)
for general expectations for PRs.
- Larger or significant changes should be discussed in an issue before
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([discussion](#8098)).
</details>

---------

Co-authored-by: Helin Shiah <helinx@google.com>

Author: chika3742

AUTHORS

@@ -26,3 +26,4 @@ Mohamed El Sayed <devblooming@tutanota.com>
 Edwin Ludik <edwin.ludik@gmail.com>
 Japnit Singh <truejswalia@gmail.com>
 Dmitry Kandalov <dmitry.kandalov@gmail.com>
+Kazuya Chikamatsu <kazu.chika.shima@gmail.com>

CHANGELOG.md

@@ -11,6 +11,7 @@
 ### Fixed
 
 - Silent failure when opening Flutter projects without `.idea` directory in IntelliJ IDEA, by removing `FlutterProjectOpenProcessor` and migrating configuration logic to `FlutterInitializer`. (#8845)
+- Gutter buttons not running tests with non-ASCII characters in their names. (#7985)
 
 ## 90.0.0
 

src/io/flutter/run/common/CommonTestConfigUtils.java

@@ -130,13 +130,16 @@ public String findTestName(@Nullable PsiElement elt) {
     final DartCallExpression call = findEnclosingTestCall(elt, getTestsFromOutline(elt.getContainingFile()));
     if (call == null) return null;
 
+    return extractTestName(call);
+  }
+
+  @VisibleForTesting
+  @Nullable
+  public String extractTestName(@NotNull DartCallExpression call) {
     final DartStringLiteralExpression lit = DartSyntax.getArgument(call, 0, DartStringLiteralExpression.class);
     if (lit == null) return null;
 
-    final String name = DartSyntax.unquote(lit);
-    if (name == null) return null;
-
-    return StringUtil.escapeProperty(name, false);
+    return DartSyntax.unquote(lit);
   }
 
   /**

testSrc/unit/io/flutter/run/common/CommonTestConfigUtilsTest.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2026 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+package io.flutter.run.common;
+
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.impl.source.tree.LeafPsiElement;
+import com.jetbrains.lang.dart.psi.DartCallExpression;
+import io.flutter.AbstractDartElementTest;
+import io.flutter.dart.DartSyntax;
+import io.flutter.run.test.TestConfigUtils;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+public class CommonTestConfigUtilsTest extends AbstractDartElementTest {
+  @Test
+  public void extractTestNameShouldNotEscapeNonAscii() throws Exception {
+    run(() -> {
+      final PsiElement testKeyword = setUpDartElement(
+        "main() { test('テスト', () {}); }", "test", LeafPsiElement.class);
+      final DartCallExpression call =
+        DartSyntax.findEnclosingFunctionCall(testKeyword, "test");
+      assertNotNull(call);
+
+      final String name = TestConfigUtils.getInstance().extractTestName(call);
+      assertEquals("テスト", name);
+    });
+  }
+}