fix obvious regression

src/control/ClipboardHandler.cpp

@@ -175,7 +175,7 @@ auto ClipboardHandler::copy() -> bool
 		}
 	}
 
-	string text = text;
+	string text{};
 	for (GList* l = textElements; l != nullptr; l = l->next)
 	{
 		Text* e = static_cast<Text*>(l->data);

src/control/Control.cpp

@@ -2665,7 +2665,7 @@ auto Control::showSaveDialog() -> bool
 
 void Control::updateWindowTitle()
 {
-	string title = title;
+	string title{};
 
 	this->doc->lock();
 	if (doc->getFilename().isEmpty())

src/gui/toolbarMenubar/ToolMenuHandler.cpp

@@ -298,7 +298,7 @@ void ToolMenuHandler::signalConnectCallback(GtkBuilder* builder, GObject* object
 		const gchar* handlerName, GObject* connectObject, GConnectFlags flags, ToolMenuHandler* self)
 {
 	string actionName = handlerName;
-	string groupName = groupName;
+	string groupName{};
 
 	size_t pos = actionName.find(':');
 	if (pos != string::npos)

src/gui/toolbarMenubar/model/ToolbarData.cpp

@@ -113,7 +113,7 @@ void ToolbarData::saveToKeyFile(GKeyFile* config)
 
 	for (ToolbarEntry* e : this->contents)
 	{
-		string line = line;
+		string line{};
 
 		for (ToolbarItem* it : e->getItems())
 		{