QmlJS: Allow forced rescan on already known paths

Qml files used by Quick tests are not necessarily added to the
project file and therefore not fully handled by the QmlJS code
model / snapshot.
When adding qml files to a directory that is handled by the
code model these folders are not scanned again - we need to
enforce such a scan on AutoTest plugin's side.

Task-number: QTCREATORBUG-17805
Change-Id: Ie3d071a9aa03297d618648b06d52fb298c856d25
Reviewed-by: Marco Benelli <marco.benelli@qt.io>

src/libs/qmljs/qmljsmodelmanagerinterface.h

@@ -205,7 +205,7 @@ public:
                     WorkingCopy workingCopyInternal,
                     PathsAndLanguages paths,
                     ModelManagerInterface *modelManager,
-                    bool emitDocChangedOnDisk, bool libOnly = true);
+                    bool emitDocChangedOnDisk, bool libOnly = true, bool forceRescan = false);
 
     virtual void resetCodeModel();
     void removeProjectInfo(ProjectExplorer::Project *project);