code: def eventFilter(self, widget, event):
          
          if event.type() == QEvent.KeyPress:
              key = event.key()
              shift = event.modifiers() & Qt.ShiftModifier
  
              if key == Qt.Key_Return:
                  if shift:
                      self.return_shift_pressed.emit()
                  else:
                      self.return_pressed.emit()
  
              if key == Qt.Key_Tab:
                  if self.search_text.hasFocus():
                      self.replace_text.set_current_text(
                          self.search_text.currentText())
                  self.focusNextChild()
  
          return super(FindReplace, self).eventFilter(widget, event)
docs: Event filter for search_text widget.
  
          Emits signals when presing Enter and Shift+Enter.
          This signals are used for search forward and backward.
          Also, a crude hack to get tab working in the Find/Replace boxes.