[repo, undo] Finish repository-side implementation of the undo feature (closes #893940) 1) Changes API for undo_transaction in order to raise an exception: the previous API returned a sequence of error, the user of the API needed to be careful to check explicitly. We change this for it to raise an UndoException with the list of errors as an attribute. 2) The server-side support for undoing update actions is finished 3) The configuration for `undo-support` is now a simple boolean Beware of the costs, both in DB space and in number of requests on the RDBMS backend, once this feture is activated. 4) Adds a txuuid param/attribute to the existing NoSuchTransaction exception.

     1

CSS Coding Standards

     2

--------------------

     3

     4

(Draft, to be continued)

     5

     6

:Naming: camelCase

     7

     8

Indentation rules

     9

~~~~~~~~~~~~~~~~~

    10

- 2 espaces avant les propriétés

    11

    12

- pas d'espace avant les ":", un espace après

    13

    14

- 1 seul espace entre les différentes valeurs pour une même propriété

    15

    16

    17

Documentation

    18

~~~~~~~~~~~~~

    19

Please keep rules semantically linked grouped together, with a comment about

    20

what they are for.

    21

    22

Recommendation

    23

~~~~~~~~~~~~~~

    24

- Try to use existing classes rather than introduce new ones

    25

    26

- Keep things as simple as possible while in the framework

    27

    28

- Think about later customization by application

    29

    30

- Avoid introducing a new CSS file for a few lines of CSS, at least while the

    31

  framework doesn't include packing functionalities

    32

    33