Terry J. Reedy added the comment:
I looked at _set3 and it looks plausible and possibly complete other than
testing. I added something about testing customizations to #27099. This
applied cleanly to 3.6. 3.6 started, dialog opened, new key set selected,
dialog closed, config-main.cfg looks good. Open dialog, same as custom, close
dialog, config-keys and config main changed as expected. Open 3.5, open
dialog, everything looks fine.
Now the problems.
1. To delete, one must select as current. After deletion, config tries to
reread the keyset just deleted. This prints a warning to console for each item
in the set, with message as to default used instead. The same happens with
deleting custom themes. I may have noted this somewhere, but cannot find.
In any case, the solution for both problems is to either allow deletion of
non-selected sets, and only such, or to switch to *something* before
re-reading. I open a new issue, #27245, for this.
2. More serious, the warnigs are followed by
Exception in Tkinter callback
Traceback (most recent call last):
File "F:\Python\dev\35\lib\tkinter\__init__.py", line 1550, in __call__
return self.func(*args)
File "F:\Python\dev\35\lib\idlelib\configDialog.py", line 1182, in Ok
self.Apply()
File "F:\Python\dev\35\lib\idlelib\configDialog.py", line 1186, in Apply
self.DeactivateCurrentConfig()
File "F:\Python\dev\35\lib\idlelib\configDialog.py", line 1166, in
DeactivateCurrentConfig
instance.RemoveKeybindings()
File "F:\Python\dev\35\lib\idlelib\EditorWindow.py", line 771, in
RemoveKeybindings
self.text.event_delete(event, *keylist)
File "F:\Python\dev\35\lib\idlelib\MultiCall.py", line 391, in event_delete
self.__binders[triplet[1]].unbind(triplet, func)
File "F:\Python\dev\35\lib\idlelib\MultiCall.py", line 234, in unbind
doit()
File "F:\Python\dev\35\lib\idlelib\MultiCall.py", line 232, in <lambda>
doit = lambda: self.bindedfuncs[triplet[2]][triplet[0]].remove(func)
ValueError: list.remove(x): x not in list
Hitting OK repeats warnings and traceback (the last line might have been a bit
different the first time). Only Cancel would close.
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<http://bugs.python.org/issue27173>
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