[storage/bfss] ensure bfss never remove a cw_edited item (closes #2236287)
When the <old value> == <new value> (not really and update but can happen), the
value was popped but never restored. The cw_edited attribut had wrong content
for a small time lapse.
\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/