PartDesign: use selection filter gate for picking references for pattern/transform features

src/Mod/PartDesign/Gui/TaskLinearPatternParameters.h

@@ -77,12 +77,9 @@ protected:
     virtual void changeEvent(QEvent *e);
     virtual void onSelectionChanged(const Gui::SelectionChanges& msg);
 
-    bool referenceSelectionMode;
-
 private:
     void setupUI();
     void updateUI();
-    void exitSelectionMode();
 
 private:
     Ui_TaskLinearPatternParameters* ui;