fix #128

lib/pages/search_result_page.dart

@@ -45,8 +45,9 @@ class _SearchResultPageState extends State<SearchResultPage> {
       if (suggestionsController.entry != null) {
         suggestionsController.remove();
       }
+      text = checkAutoLanguage(text);
       setState(() {
-        this.text = text;
+        this.text = text!;
       });
       appdata.addSearchHistory(text);
       controller.currentText = text;
@@ -92,13 +93,33 @@ class _SearchResultPageState extends State<SearchResultPage> {
     super.dispose();
   }
 
+  String checkAutoLanguage(String text) {
+    var setting = appdata.settings["autoAddLanguageFilter"] ?? 'none';
+    if (setting == 'none') {
+      return text;
+    }
+    var searchSource = sourceKey;
+    // TODO: Move it to a better place
+    const enabledSources = [
+      'nhentai',
+      'ehentai',
+    ];
+    if (!enabledSources.contains(searchSource)) {
+      return text;
+    }
+    if (!text.contains('language:')) {
+      return '$text language:$setting';
+    }
+    return text;
+  }
+
   @override
   void initState() {
+    sourceKey = widget.sourceKey;
     controller = SearchBarController(
-      currentText: widget.text,
+      currentText: checkAutoLanguage(widget.text),
       onSearch: search,
     );
-    sourceKey = widget.sourceKey;
     options = widget.options ?? const [];
     validateOptions();
     text = widget.text;
@@ -162,6 +183,12 @@ class _SearchResultPageState extends State<SearchResultPage> {
       child: IconButton(
         icon: const Icon(Icons.tune),
         onPressed: () async {
+          if (suggestionOverlay != null) {
+            suggestionsController.remove();
+          }
+
+          var previousOptions = options;
+          var previousSourceKey = sourceKey;
           await showDialog(
             context: context,
             useRootNavigator: true,
@@ -169,7 +196,11 @@ class _SearchResultPageState extends State<SearchResultPage> {
               return _SearchSettingsDialog(state: this);
             },
           );
-          setState(() {});
+          if (previousOptions != options || previousSourceKey != sourceKey) {
+            text = checkAutoLanguage(controller.text);
+            controller.currentText = text;
+            setState(() {});
+          }
         },
       ),
     );