QmlDesigner: Track if QDS was opened from QtC

Task-number: QDS-6315
Change-Id: I4109e9c98ff5c27b4096b1af32ae945aec10c123
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

src/plugins/qmlprojectmanager/qmlproject.cpp

@@ -517,6 +517,11 @@ bool QmlProject::isQtDesignStudio()
     return settings->value(qdsStandaloneEntry, false).toBool();
 }
 
+bool QmlProject::isQtDesignStudioStartedFromQtC()
+{
+    return qEnvironmentVariableIsSet(Constants::enviromentLaunchedQDS);
+}
+
 ProjectExplorer::DeploymentKnowledge QmlProject::deploymentKnowledge() const
 {
     return DeploymentKnowledge::Perfect;