Usually when refactoring python code I use a lot the “Find in folder…” side bar command.
There is a problem of usability though, each time you spawn a new find_in_folder command the last used settings will be resetted.
For instance, imagine you want to refactor a project with hundred of thousands of files and you just want to refactor the .py files, to avoid the file searching taking few minutes you speed it up by using the “Add include filter” and typing ".py", so far so good. Problem comes when you want to make few dozens of different replacements… each time you spawn “Find in folder…” you need to type the “Add include filter” over and over cos the command is forgetting the last settings, that’s really annoying for such a common feature. Not only that, sometimes you forget you haven’t typed this filter and the searching takes a while and after that you realize you’ve forgotten to include the filter to the search to be fast 
At this point, I wanted to take a look of the FindInFolder command source code to see whether I could change the behaviour myself so I’ve used the nice and useful old package Edit preferences to see where this command lives:
https://dl.dropboxusercontent.com/s/ym5ysnqts3idmo8/sublime_text_2018-06-27_14-20-40.png
but when I try to open it I’ll get:
Traceback (most recent call last):
File "list_commands in D:\sources\personal\sublimetext3\Data\Installed Packages\Edit Preferences.sublime-package", line 71, in on_select
File "./python3.3/inspect.py", line 715, in getsourcelines
File "./python3.3/inspect.py", line 563, in findsource
OSError: could not get source code
Anyway, before debugging that package or command I’ve decided to stop here and asking first so maybe someone knows already how to save the last settings when using the “Find in folder…” command.
Thanks in advance.