Renaming a method that has a parameter with a default value doesn't work

When attempting to rename a method with a parameter that has a default value, the rename does not work correctly. Here is the before and after code:

class Summer {
	def sumWithDefaults(a, b, d=0){
		return a + b + d
	}
}

def summer = new Summer()

assert 2 == summer.sumWithDefaults(1,1)
assert 3 == summer.sumWithDefaults(1,1,1)

refactoredSumlass Summer {
	def sumWithDefaults(a, b, d=0){
		return a + b + d
	}
}

def summer = new Summer()

assert 2 == summer.refactoredSum(1,1)
assert 3 == summer.sumWithDefaults(1,1,1)

This is the expected result:

class Summer {
	def refactoredSum(a, b, d=0){
		return a + b + d
	}
}

def summer = new Summer()

assert 2 == summer.refactoredSum(1,1)
assert 3 == summer.refactoredSum(1,1,1)

These are the specific problems observed:

1. The new method name replaces the first character in the file
2. The new method name does not actually replace the old method name in the method declaration
3. Not all method calls with the old name and a matching signature are refactored
   • Only method calls who's call signature matches the parameters with no default value are updated