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Based on the github comments on PR5638, some code cleanup issues identified for codecontext.
codecontext
* getspacesfirstword - function and param1 name
* get_line_info - make into helper function and change parm
* get_context - call to get_line_info sends text instead of line number
* toggle_code_context_event - move border calc to same loop at padx
* cleanup some comments
test_codecontext
* test_get_line_info - move test to helper test class and change parm from line number to line
* test_get_line_info - add test for tab (I noticed 'indent' is 1 when the regex matches to a tab. Even though IDLE doesn't allow tabs in the editor, I didn't want to lose track of this).
* test_getspacesfirstword - function name
* test_del - remove call to after info

Super list. It made the diff really easy to parse into related changes. I printed it, reviewed code for items one by one, made a few changes, and checked them off when satisfied.
IDLE *does* (sort of) allow tabs. One can read a file with tabs or Format => Tabify. Config-main.def still has 'use-spaces= 1' and I believe it is still read and acted on, at least in some places. (This is, of course, untested.) The option to turn it off on the dialog has been removed, but I believe it still could be turned off by hand-editing .idlerc/config-main.cfg. Of course, since 3.x rejects mixtures, beginners should expand tabs before editing existing files.
I have thought about possibly reviewing the tab situation, but in the absence of people having problems with the status quo, it is very low priority. Maybe after 3.8 and the end of 2.x support.

New changeset 8506016f904ba6bc27bf5261f27a0bdd5945cd26 by Terry Jan Reedy (Cheryl Sabella) in branch 'master':
 bpo-33628: IDLE: Minor code cleanup of codecontext.py and its tests (GH-7085)
https://github.com/python/cpython/commit/8506016f904ba6bc27bf5261f27a0bdd5945cd26

New changeset 935c81bbbca28ca23862d7ee1f79cd502e447edd by Miss Islington (bot) in branch '3.6':
bpo-33628: IDLE: Minor code cleanup of codecontext.py and its tests (GH-7085)
https://github.com/python/cpython/commit/935c81bbbca28ca23862d7ee1f79cd502e447edd

New changeset b2ab5dc72b36d074a86f2b1d91ae804e5a7210f8 by Miss Islington (bot) in branch '3.7':
bpo-33628: IDLE: Minor code cleanup of codecontext.py and its tests (GH-7085)
https://github.com/python/cpython/commit/b2ab5dc72b36d074a86f2b1d91ae804e5a7210f8