Confusing output from 2to3 about what files need change

[Moonwatcher]

Porting my 2.7 code to python 3.6.7

Two confusing issues:
1. 2to3 found changes on second run.

After running 2to3 on a dir so changes are made, tested, and committed, I run it again latter to check and it found new changes.

Now it wants to add 'list' to all previous changes of '.iteritems()' to 'items()'

I understand why from my research, but why did it not make the change the first time? I can reproduce this behavior every time.

e.g.

- for k,v in self.all_devices.items():
+ for k,v in list(self.all_devices.items()):

2. output of 2to3 seems to say no changes needed but then gives list of files to be modified.

After running twice 2to3 on a dir so all needed changes are made, tested, and committed, I run it again latter to check and this output like this (note bold):

$ 2to3 *py
RefactoringTool: Skipping optional fixer: buffer
RefactoringTool: Skipping optional fixer: idioms
RefactoringTool: Skipping optional fixer: set_literal
RefactoringTool: Skipping optional fixer: ws_comma
RefactoringTool: No changes to DeviceMap.py
RefactoringTool: No changes to DeviceMapSnmp.py
RefactoringTool: No changes to SnmpSensor.py
RefactoringTool: No changes to SnmpSensors.py
RefactoringTool: Files that need to be modified:
RefactoringTool: DeviceMap.py
RefactoringTool: DeviceMapSnmp.py
RefactoringTool: SnmpSensor.py
RefactoringTool: SnmpSensors.py

If I run a third time with the -w option no changes are made. It seems this output is misleading, right?