Sometimes Qt Creator doesn't clean up after itself--this should take care of that.

QtUiCleaner

#!/bin/python3

import sys;
from lxml import etree;

def clean(f):
  print("Processing "+f+"...")
  tree = etree.parse(f)
  root = tree.getroot()
  used_actions=[]
  for child in root.iter('addaction'):
    used_actions.append(child.get('name'))
  for child in root.iter('action'):
    if child.get('name') not in used_actions:
      print("Cleaning "+child.get('name'))
      child.getparent().remove(child)
  tree.write(f)

args = iter(sys.argv)
next(args)
for arg in args:
  clean(arg)