Simplify CallbackRegistry pickling. #16219
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The deleted comment was really only relevant to Py2. Preserving _cid_gen (which is picklable) is necessary to later enable careful pickling of select callbacks, such as 3d mouse handlers (otherwise, the same cid may be assigned twice, one before pickling and once after unpickling).
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QuLogic
approved these changes
Mar 9, 2020
timhoffm
approved these changes
Mar 9, 2020
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The deleted comment was really only relevant to Py2.
Preserving _cid_gen (which is picklable) is necessary to later enable
careful pickling of select callbacks, such as 3d mouse handlers (#10843)
(otherwise, the same cid may be assigned twice, one before pickling and
once after unpickling).
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