Issue 5013 - Mark more method as const

src/FilterEngine.cpp

Index: src/FilterEngine.cpp
===================================================================
--- a/src/FilterEngine.cpp
+++ b/src/FilterEngine.cpp
@@ -328,17 +328,17 @@
   return jsEngine->Evaluate("API.isAASubscriptionEnabled()")->AsBool();
 }
 
 std::string FilterEngine::GetAAUrl() const
 {
   return GetPref("subscriptions_exceptionsurl")->AsString();
 }
 
-void FilterEngine::ShowNextNotification(const std::string& url)
+void FilterEngine::ShowNextNotification(const std::string& url) const
 {
   JsValuePtr func = jsEngine->Evaluate("API.showNextNotification");
   JsConstValueList params;
   if (!url.empty())
   {
     params.push_back(jsEngine->NewValue(url));
   }
   func->Call(params);
@@ -457,17 +457,17 @@
 }
 
 void FilterEngine::RemoveUpdateAvailableCallback()
 {
   jsEngine->RemoveEventCallback("updateAvailable");
 }
 
 void FilterEngine::UpdateAvailable(
-    FilterEngine::UpdateAvailableCallback callback, JsValueList& params)
+    FilterEngine::UpdateAvailableCallback callback, JsValueList& params) const
 {
   if (params.size() >= 1 && !params[0]->IsNull())
     callback(params[0]->AsString());
 }
 
 void FilterEngine::ForceUpdateCheck(
     const FilterEngine::UpdateCheckDoneCallback& callback)
 {
@@ -511,25 +511,25 @@
 std::unique_ptr<std::string> FilterEngine::GetAllowedConnectionType() const
 {
    auto prefValue = GetPref("allowed_connection_type");
    if (prefValue->AsString().empty())
      return nullptr;
    return std::unique_ptr<std::string>(new std::string(prefValue->AsString()));
 }
 
-void FilterEngine::FilterChanged(FilterEngine::FilterChangeCallback callback, JsValueList& params)
+void FilterEngine::FilterChanged(FilterEngine::FilterChangeCallback callback, JsValueList& params) const
 {
   std::string action(params.size() >= 1 && !params[0]->IsNull() ? params[0]->AsString() : "");
   JsValuePtr item(params.size() >= 2 ? params[1] : jsEngine->NewValue(false));
   callback(action, item);
 }
 
 void FilterEngine::ShowNotification(const ShowNotificationCallback& callback,
-                                         const JsValueList& params)
+                                         const JsValueList& params) const
 {
   if (params.size() < 1)
     return;
 
   if (!params[0]->IsObject())
   {
     return;
   }