Tree state is lost on reload

On reload (or context change) the client should save in memory the tree state and restore it.

added sao tryton type::behavior + 1 deleted label

assigned to @ced

added 1 deleted label and removed 1 deleted label

added 1 deleted label and removed 1 deleted label

New review361811002 at https://codereview.tryton.org/361811002/#ps334281002

New changeset 70649b570880 by Cédric Krier in branch 'default':
Do not clear tree_states when loading ids
https://hg.tryton.org/sao/rev/70649b570880

added 1 deleted label and removed 1 deleted label

closed

New changeset 3c66d5f1cc00 by Cédric Krier in branch 'default':
Do not clear tree_states when loading ids
https://hg.tryton.org/tryton/rev/3c66d5f1cc00

New changeset 1b1b95edad33 by Cédric Krier in branch 'default':
Do not clear tree_states when loading ids
https://hg.tryton.org/tryton-env/rev/1b1b95edad33

New changeset 4d64152e3bda by Cédric Krier in branch '5.8':
Do not clear tree_states when loading ids
https://hg.tryton.org/sao/rev/4d64152e3bda

New changeset a3c189f9b3aa by Cédric Krier in branch '5.6':
Do not clear tree_states when loading ids
https://hg.tryton.org/sao/rev/a3c189f9b3aa

New changeset a4b2234ca214 by Cédric Krier in branch '5.0':
Do not clear tree_states when loading ids
https://hg.tryton.org/sao/rev/a4b2234ca214

New changeset 82ef45f0c88e by Cédric Krier in branch '5.8':
Do not clear tree_states when loading ids
https://hg.tryton.org/tryton/rev/82ef45f0c88e

New changeset f5a250ad2b4f by Cédric Krier in branch '5.6':
Do not clear tree_states when loading ids
https://hg.tryton.org/tryton/rev/f5a250ad2b4f

New changeset 512adb5869a8 by Cédric Krier in branch '5.0':
Do not clear tree_states when loading ids
https://hg.tryton.org/tryton/rev/512adb5869a8