ControlLayout: Allow removing search bar's focus

include/ControlLayout.h

@@ -110,6 +110,9 @@ public:
 	void setGeometry(const QRect &rect) override;
 	QSize sizeHint() const override;
 	QLayoutItem *takeAt(int index) override;
+	//! remove focus from QLineEdit search bar
+	//! this may be useful if the mouse is outside the layout
+	void removeFocusFromSearchBar();
 
 private slots:
 	void onTextChanged(const QString&);

include/LinkedModelGroupViews.h

@@ -71,6 +71,8 @@ protected:
 
 	void removeControl(const QString &key);
 
+	void removeFocusFromSearchBar();
+
 private:
 	class LinkedModelGroup* m_model;