Add missing streamlink option & make preferredQuality lowercase

src/widgets/settingspages/behaviourpage.cpp

@@ -11,7 +11,7 @@
 #define LAST_MSG "Show last read message indicator"
 #define PAUSE_HOVERING "When hovering"
 
-#define STREAMLINK_QUALITY "Source", "High", "Medium", "Low", "Audio only"
+#define STREAMLINK_QUALITY "Choose", "Source", "High", "Medium", "Low", "Audio only"
 
 namespace chatterino {
 namespace widgets {

src/widgets/split.cpp

@@ -371,6 +371,7 @@ void Split::doOpenStreamlink()
 {
     singletons::SettingManager &settings = singletons::SettingManager::getInstance();
     QString preferredQuality = settings.preferredQuality;
+    preferredQuality = preferredQuality.toLower();
     // TODO(Confuseh): Default streamlink paths
     QString path = settings.streamlinkPath;
     QString channel = QString::fromStdString(this->channelName.getValue());