Refresh layout pickles

[mdickinson]

This PR refreshes the two layout pickle files, by simply reading and then writing them again with Traits 6.3.2. This has the effect of changing the module used for importing TraitListObject from traits.trait_handlers to traits.trait_list_object.

Should fix #471.

For the record, here's the transcript of the session used to re-create the pickles:

Pickle re-recreation

mdickinson@mirzakhani data % python
Enthought Deployment Manager -- https://www.enthought.com
Python 3.6.13 |Enthought, Inc. (x86_64)| (default, Apr 13 2021, 19:22:11) 
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import traits
>>> traits.__version__
'6.3.2'
>>> import os
>>> os.listdir(".")
['application_memento_v3.pkl', 'application_memento_v2.pkl']
>>> pkls = os.listdir(".")
>>> import pathlib, pickle
>>> p = pathlib.Path(pkls[0])
>>> p.read_bytes()
b'\x80\x03cenvisage.ui.tasks.tasks_application\nTasksApplicationState\nq\x00)\x81q\x01}q\x02(X\x17\x00\x00\x00previous_window_layoutsq\x03ctraits.trait_handlers\nTraitListObject\nq\x04)\x81q\x05cpyface.tasks.task_window_layout\nTaskWindowLayout\nq\x06)\x81q\x07}q\x08(X\x0b\x00\x00\x00active_taskq\tX\x00\x00\x00\x00q\nX\x05\x00\x00\x00itemsq\x0bh\x04)\x81q\x0c}q\r(X\x04\x00\x00\x00nameq\x0eh\x0bX\n\x00\x00\x00name_itemsq\x0fX\x0b\x00\x00\x00items_itemsq\x10ubX\x08\x00\x00\x00positionq\x11J\xff\xff\xff\xffJ\xff\xff\xff\xff\x86q\x12X\x04\x00\x00\x00sizeq\x13M\xec\x01M\xe7\x02\x86q\x14X\n\x00\x00\x00size_stateq\x15X\x06\x00\x00\x00normalq\x16X\x12\x00\x00\x00__traits_version__q\x17X\x05\x00\x00\x005.1.2q\x18uba}q\x19(h\x0eh\x03h\x0fX\x1d\x00\x00\x00previous_window_layouts_itemsq\x1aubX\x0e\x00\x00\x00window_layoutsq\x1bh\x04)\x81q\x1c}q\x1d(h\x0eh\x1bh\x0fX\x14\x00\x00\x00window_layouts_itemsq\x1eubX\x07\x00\x00\x00versionq\x1fK\x01h\x17h\x18ub.'
>>> pickle.loads(p.read_bytes())
<envisage.ui.tasks.tasks_application.TasksApplicationState object at 0x7fcc1042e678>
>>> pickle.dumps(pickle.loads(p.read_bytes()))
b'\x80\x03cenvisage.ui.tasks.tasks_application\nTasksApplicationState\nq\x00)\x81q\x01}q\x02(X\x17\x00\x00\x00previous_window_layoutsq\x03ctraits.trait_list_object\nTraitListObject\nq\x04)\x81q\x05cpyface.tasks.task_window_layout\nTaskWindowLayout\nq\x06)\x81q\x07}q\x08(X\x0b\x00\x00\x00active_taskq\tX\x00\x00\x00\x00q\nX\x05\x00\x00\x00itemsq\x0bh\x04)\x81q\x0c}q\r(X\x0e\x00\x00\x00item_validatorq\x0ecbuiltins\ngetattr\nq\x0fh\x0cX\x0f\x00\x00\x00_item_validatorq\x10\x86q\x11Rq\x12X\x04\x00\x00\x00nameq\x13h\x0bX\n\x00\x00\x00name_itemsq\x14X\x0b\x00\x00\x00items_itemsq\x15ubX\x08\x00\x00\x00positionq\x16J\xff\xff\xff\xffJ\xff\xff\xff\xff\x86q\x17X\x04\x00\x00\x00sizeq\x18M\xec\x01M\xe7\x02\x86q\x19X\n\x00\x00\x00size_stateq\x1aX\x06\x00\x00\x00normalq\x1bX\x12\x00\x00\x00__traits_version__q\x1cX\x05\x00\x00\x006.3.2q\x1duba}q\x1e(h\x0eh\x0fh\x05h\x10\x86q\x1fRq h\x13h\x03h\x14X\x1d\x00\x00\x00previous_window_layouts_itemsq!ubX\x0e\x00\x00\x00window_layoutsq"h\x04)\x81q#}q$(h\x0eh\x0fh#h\x10\x86q%Rq&h\x13h"h\x14X\x14\x00\x00\x00window_layouts_itemsq\'ubX\x07\x00\x00\x00versionq(K\x01h\x1ch\x1dub.'
>>> p.write_bytes(pickle.dumps(pickle.loads(p.read_bytes())))
660
>>> p = pathlib.Path(pkls[1])
>>> p.read_bytes()
b'\x80\x02cenvisage.ui.tasks.tasks_application\nTasksApplicationState\nq\x00)\x81q\x01}q\x02(X\x17\x00\x00\x00previous_window_layoutsq\x03ctraits.trait_handlers\nTraitListObject\nq\x04)\x81q\x05cpyface.tasks.task_window_layout\nTaskWindowLayout\nq\x06)\x81q\x07}q\x08(X\x0b\x00\x00\x00active_taskq\tX\x00\x00\x00\x00q\nX\x05\x00\x00\x00itemsq\x0bh\x04)\x81q\x0c}q\r(X\x04\x00\x00\x00nameq\x0eh\x0bX\n\x00\x00\x00name_itemsq\x0fX\x0b\x00\x00\x00items_itemsq\x10ubX\x08\x00\x00\x00positionq\x11J\xff\xff\xff\xffJ\xff\xff\xff\xff\x86q\x12X\x04\x00\x00\x00sizeq\x13M\xec\x01M\xe7\x02\x86q\x14X\n\x00\x00\x00size_stateq\x15X\x06\x00\x00\x00normalq\x16X\x12\x00\x00\x00__traits_version__q\x17X\x05\x00\x00\x005.1.2q\x18uba}q\x19(h\x0eh\x03h\x0fX\x1d\x00\x00\x00previous_window_layouts_itemsq\x1aubX\x0e\x00\x00\x00window_layoutsq\x1bh\x04)\x81q\x1c}q\x1d(h\x0eh\x1bh\x0fX\x14\x00\x00\x00window_layouts_itemsq\x1eubX\x07\x00\x00\x00versionq\x1fK\x01h\x17h\x18ub.'
>>> p.write_bytes(pickle.dumps(pickle.loads(p.read_bytes()), protocol=2))
663
>>> p.read_bytes()
b'\x80\x02cenvisage.ui.tasks.tasks_application\nTasksApplicationState\nq\x00)\x81q\x01}q\x02(X\x17\x00\x00\x00previous_window_layoutsq\x03ctraits.trait_list_object\nTraitListObject\nq\x04)\x81q\x05cpyface.tasks.task_window_layout\nTaskWindowLayout\nq\x06)\x81q\x07}q\x08(X\x0b\x00\x00\x00active_taskq\tX\x00\x00\x00\x00q\nX\x05\x00\x00\x00itemsq\x0bh\x04)\x81q\x0c}q\r(X\x0e\x00\x00\x00item_validatorq\x0ec__builtin__\ngetattr\nq\x0fh\x0cX\x0f\x00\x00\x00_item_validatorq\x10\x86q\x11Rq\x12X\x04\x00\x00\x00nameq\x13h\x0bX\n\x00\x00\x00name_itemsq\x14X\x0b\x00\x00\x00items_itemsq\x15ubX\x08\x00\x00\x00positionq\x16J\xff\xff\xff\xffJ\xff\xff\xff\xff\x86q\x17X\x04\x00\x00\x00sizeq\x18M\xec\x01M\xe7\x02\x86q\x19X\n\x00\x00\x00size_stateq\x1aX\x06\x00\x00\x00normalq\x1bX\x12\x00\x00\x00__traits_version__q\x1cX\x05\x00\x00\x006.3.2q\x1duba}q\x1e(h\x0eh\x0fh\x05h\x10\x86q\x1fRq h\x13h\x03h\x14X\x1d\x00\x00\x00previous_window_layouts_itemsq!ubX\x0e\x00\x00\x00window_layoutsq"h\x04)\x81q#}q$(h\x0eh\x0fh#h\x10\x86q%Rq&h\x13h"h\x14X\x14\x00\x00\x00window_layouts_itemsq\'ubX\x07\x00\x00\x00versionq(K\x01h\x1ch\x1dub.'

[rahulporuri]

LGTM 🎉

[mdickinson]

Thanks, @rahulporuri. I've sneakily added to this PR after you approved it, adding (a) a script that regenerates the pickles (on my machine, the generated pickled are byte-for-byte identical with the existing .pkl files), and (b) a README.md for this directory.

Will merge when CI approves, and then retry the cron job.