[Spreadsheet] Fix popup close issue (#19676)

* [Spreadsheet] Fix popup close issue

src/Mod/Spreadsheet/Gui/ZoomableView.cpp

@@ -187,6 +187,11 @@ void ZoomableView::updateView(void)
     centerOn(new_geometry.center());
 }
 
+void ZoomableView::focusOutEvent(QFocusEvent* event)
+{
+    Q_UNUSED(event);
+}
+
 void ZoomableView::keyPressEvent(QKeyEvent* event)
 {
     if (event->modifiers() & Qt::ControlModifier) {

src/Mod/Spreadsheet/Gui/ZoomableView.h

@@ -73,6 +73,7 @@ private:
     int m_zoomLevel;
 
 protected:
+    void focusOutEvent(QFocusEvent* event) override;
     void keyPressEvent(QKeyEvent* event) override;
     void resizeEvent(QResizeEvent* event) override;
     void wheelEvent(QWheelEvent* event) override;