QML Debugger: Handle QtInfoMsg messages in console

Before those were ignored. Also add a soft assert that will trigger if
we forget to add some other category here.

Change-Id: Iff3b33ab6c8defe935b681dd80bf185cd95e54f7
Task-number: QTCREATORBUG-20117
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/qml/qmlengineutils.cpp

@@ -210,6 +210,7 @@ void appendDebugOutput(QtMsgType type, const QString &message, const QDebugConte
 {
     ConsoleItem::ItemType itemType;
     switch (type) {
+    case QtInfoMsg:
     case QtDebugMsg:
         itemType = ConsoleItem::DebugType;
         break;
@@ -220,11 +221,10 @@ void appendDebugOutput(QtMsgType type, const QString &message, const QDebugConte
     case QtFatalMsg:
         itemType = ConsoleItem::ErrorType;
         break;
-    default:
-        //This case is not possible
-        return;
     }
 
+    QTC_ASSERT(itemType != ConsoleItem::DefaultType, return);
+
     debuggerConsole()->printItem(new ConsoleItem(itemType, message, info.file, info.line));
 }