Fix recent changes for Linux and add pipeline for testing Linux builds (

#157)

* Add workflow for testing Linux

* Fix Linux build errors

/webview_cef/example/linux/flutter/ephemeral/.plugin_symlinks/webview_cef/common/webview_js_handler.cc:180:21: error: enumeration value 'UNKNOWN' not handled in switch [-Werror,-Wswitch]
/webview_cef/example/linux/flutter/ephemeral/.plugin_symlinks/webview_cef/common/webview_plugin.cc:434:24: error: 4 enumeration values not handled in switch: 'VTYPE_INVALID', 'VTYPE_NULL', 'VTYPE_BINARY'... [-Werror,-Wswitch]
/webview_cef/example/linux/flutter/ephemeral/.plugin_symlinks/webview_cef/common/webview_plugin.cc:430:41: error: variable 'retValue' is uninitialized when used here [-Werror,-Wuninitialized]

.github/workflows/test_linux_x86.yaml

@@ -0,0 +1,41 @@
+name: Test if the example app still builds on Linux x86
+on:
+  push:
+    branches: ["main"]
+    paths:
+      - "common/**"
+      - "example/**"
+      - "lib/**"
+      - "linux/**"
+      - "third/**"
+      - "pubspec.yaml"
+      - ".github/workflows/test_linux_x86.yaml"
+  pull_request:
+    paths:
+      - "common/**"
+      - "example/**"
+      - "lib/**"
+      - "linux/**"
+      - "third/**"
+      - "pubspec.yaml"
+      - ".github/workflows/test_linux_x86.yaml"
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v4
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v2
+        with:
+          channel: stable
+      - run: |
+          sudo apt-get update -y
+          sudo apt-get install -y ninja-build libgtk-3-dev clang cmake pkg-config build-essential
+      - run: flutter --version
+      - run: lsb_release -a
+      - run: clang --version
+      - run: cmake --version
+      - run: g++ --version
+      - run: (cd example && flutter build linux)

common/webview_js_handler.cc

@@ -214,6 +214,10 @@ bool CefJSBridge::EvaluateCallback(const CefString& callbackId, const JSValue& r
                     args->SetList(1, arrayList);
                     break;
                 }
+                default:
+                    // For avoiding values like
+                    // error: enumeration value 'UNKNOWN' not handled in switch [-Werror,-Wswitch]
+                    break;
             }
 
             // 메시지 전송

common/webview_plugin.cc

@@ -427,7 +427,6 @@ namespace webview_cef {
 
                 if (values == nullptr) {
                     result(1, nullptr);
-                    webview_value_unref(retValue);
                     return;
                 }
 
@@ -444,7 +443,7 @@ namespace webview_cef {
                     case VTYPE_STRING:
                         retValue = webview_value_new_string(values->GetString().ToString().c_str());
                         break;
-                    case VTYPE_LIST:
+                    case VTYPE_LIST: {
                         retValue = webview_value_new_list();
                         CefRefPtr<CefListValue> list = values->GetList();
 
@@ -467,6 +466,11 @@ namespace webview_cef {
                             }
                         }
                         break;
+                    }
+                    default:
+                        // Return null as fallback
+                        result(1, nullptr);
+                        return;
                 }
 
 				result(1, retValue);