Get clear search button from search line edit

sohstationviewer/view/ui/main_ui.py

@@ -399,6 +399,20 @@ class UIMainWindow(object):
         self.search_line_edit.setToolTip('Filter the list of files based on '
                                          'the content.')
         self.search_line_edit.setClearButtonEnabled(True)
+        try:
+            # This value was obtained from the C++ source of QT. We use it here
+            # so that the QAction found is guaranteed to be the clear button.
+            clear_action_name = '_q_qlineeditclearaction'
+            found_actions = self.search_line_edit.findChildren(
+                QAction, clear_action_name
+            )
+            self.clear_search_action = found_actions[0]
+        except IndexError:
+            # If the name of the clear button is changed in the C++ source of
+            # QT, nothing will be found. So, we raise
+            raise ValueError('No clear button could be found. Check its '
+                             'objectName attribute using QObject.findChildren '
+                             'without a name.')
         search_layout.addWidget(self.search_line_edit)
         search_layout.addSpacing(2)
         self.search_button = QPushButton('Search', self.central_widget)