GenericProject: Fix display of files in project directory

Having a folder "." in the project tree is ugly, so fix that.

Task-number: QTCREATORBUG-15344
Change-Id: I0817f609162dbc39f7bb4f98e6afe85169710fb7
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/genericprojectmanager/genericprojectnodes.cpp

@@ -79,6 +79,9 @@ QHash<QString, QStringList> sortFilesIntoPaths(const QString &base, const QSet<Q
                 relativeFilePath.chop(1);
         }
 
+        if (relativeFilePath == QLatin1String("."))
+            relativeFilePath.clear();
+
         filesInPath[relativeFilePath].append(absoluteFileName);
     }
     return filesInPath;