Even though it should not raise, a stale lock would be a serious issue.

The intent is to be able to tell that an independently-defined group of
activity nodes may execute given activity, and no other node.
This allows more flexible parallelism control than serialization_tag.

Divide conflict hot-spot to improve write performance: now, conflict risk
will not be proportional to the number of zope processes, but only to the
number of threads within considered process (...because there is no
stable thread name, if there is one day and conflict splitting is needed,
it will be easy to implement: just concatenate that name to node name in
FragmentedLength._map).
Automatically migrate to FragmentedCount on containers larger than 1k
objects (this threshold may evolve).

Provide a way to generate ids on specific documents when they make sense.
Reduces the risk of conflicts that portal_ids's in-ZODB id generator
creates.
Reset generator state on any copy (both copy/pase and clone), but not on
move (cut/paste and setId).

These two classes inherits from two classes implementing CopyContainer API:
- ours, via low-priority bases
- another one, via higher-priority bases, because these classes need
  some non-ERP5 methods to override ERP5 methods.
So after defining these classes, resolve inheritance priority by binding
all CopyContainer methods provided by their ERP5 base class, overriding
the ones provided by their non-ERP5 bases while still allowing their ERP5
base class to override the CopyContainer method.

Allows for safe migration to another id generator, by preventing silent
success of any piece of code still using the former generator, allowing
its detection and resolution before duplicate ids are emitted.
As a consequence, also allows on-demand and partial migration of id
generators.

erp5_trade: Fix PackingList_getODTDataDict.py. Get source reference from supply paths. Movements are not predicates.

Otherwise, this test fails because of duplicate uids.

Display precalculated listbox content returned after a form validation
error.

Ensure the cell error_text is displayed and can be removed.

Return the submitted value in case if present in the REQUEST.

Return the cell error_text if present.

Execute the listbox listmethod in case of ValidationError.
Ensure that it is rendered with the same query parameters.

This commit does not change the behaviour of the gadget.

The goal is only to make the next commit more readable.

Even if it does not lead to ConflictError being raised, updating _max_uid
has a cost and a transaction-serialising effect (most noticeable with NEO).
This value is not used (outside of a bootstrap value for portal_ids
generator), so stop doing this unnecessary work.
Also, fold produceUid into its only caller.
Also, change the folded pattern to react to an empty buffer rather than
test for emptiness before each access.

The way of truncating the index file was an error in git 2.11.0, but it
was not an error with git 2.17.0.

/reviewed-on nexedi/erp5!863

Follow xhtml_style CSS.

This is nearly a copy/paste of renderJS error rendering.

While rendering a field_list gadget in non-editable mode,
the `text_content` parameter was given only in the first `render` call.

/bug #20190204-39AF19
https://nexedijs.erp5.net/#/bug_module/20190204-39AF19

/reviewed-on !860

Before we were using up to 10 testnodes per test suite. Push it to 15 testnodes to have
chance to run big test suite (like whole ERP5 tests) in less than 2 hours.

/reviewed-on !859