Debugger: Don't auto-enable QML debugging if LANG_QMLJS isn't set

Change-Id: Id2734ed9615e6c4035d2eacb5bf57dbb2d5029e4
Task-number: QTCREATORBUG-15490
Reviewed-by: hjk <hjk@theqtcompany.com>
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/debugger/debuggerrunconfigurationaspect.cpp

@@ -253,6 +253,10 @@ bool DebuggerRunConfigurationAspect::useCppDebugger() const
 bool DebuggerRunConfigurationAspect::useQmlDebugger() const
 {
     if (m_useQmlDebugger == DebuggerRunConfigurationAspect::AutoEnabledLanguage) {
+        const Core::Context languages = runConfiguration()->target()->project()->projectLanguages();
+        if (!languages.contains(ProjectExplorer::Constants::LANG_QMLJS))
+            return false;
+
         //
         // Try to find a build step (qmake) to check whether qml debugging is enabled there
         // (Using the Qt metatype system to avoid a hard qt4projectmanager dependency)
@@ -267,9 +271,7 @@ bool DebuggerRunConfigurationAspect::useQmlDebugger() const
             }
         }
 
-        const Core::Context languages = runConfiguration()->target()->project()->projectLanguages();
-        return languages.contains(ProjectExplorer::Constants::LANG_QMLJS)
-            && !languages.contains(ProjectExplorer::Constants::LANG_CXX);
+        return !languages.contains(ProjectExplorer::Constants::LANG_CXX);
     }
     return m_useQmlDebugger == DebuggerRunConfigurationAspect::EnabledLanguage;
 }