Setting a translation

Assumptions

We're not setting a translation that's identical to the current one.

We've checked that lock_timestamp is newer than the last update date.

A diverged message cannot be both the current Ubuntu message and the current upstream message. Those would be diverged in different templates.

When we look for an "identical" message, we look for ones that are either shared or diverged in the same template that we're looking at. We completely ignore messages that are diverged to other templates.

What happens to the existing current message

A: Deactivate & converge.

  If there is already an identical shared message:
    current.delete()
  else:
    current.is_current = False
    current.potemplate = None

B: Deactivate.

  current.is_current = False

What happens to the new current message

Some numbers are unused because their scenarios have collapsed into other ones.

1. create TM 'new'

• new.is_current = True

2. create TM 'new'

• new.is_current = True new.potemplate = current.potemplate

4. new.is_current = True

5. if new.is_current: pass

• else: (2)

7. new.potemplate = None (watch for existing identical TM)

• new.is_current = True

⊕. MERGING POLICY determines if we need to do:

• Look for shared translation with the is_other flag set: 'other' If found:
  • other.is_other = False new.is_other = True

By default, the policy should approve the change on is_other if working on upstream; or if working on Ubuntu but with privileges to edit both.

Execution matrix

                +-------------------------------------+
                |     IDENTICAL EXISTING TM 'new'     |
                +------+--------+----------+----------+
                |      |        |          | upstream |
                | None | shared | diverged |  shared  |
 +---+----------+---------------+----------+----------+
 | C |  None    |  Z1⊕ |   Z4⊕  |    Z7⊕   |    Z4⊕   |
 | U +----------+------+--------+----------+----------+
 | R |  shared  |  B1  |   B4   |    B7    |    B4    |
 | R +----------+------+--------+----------+----------+
 | E | diverged |  A2  |   A5   |    A4    |    A5    |
 | N +----------+------+--------+----------+----------+
 | T | upstream |  B1⊕ |  B4⊕   |    B7⊕ |    ∅     |
 |   |  shared  |      |        |          |          |
 +---+----------+------+--------+----------+----------+

Notes

A diverged message can mask a similar shared message as well. We tried to take this into account throughout, and believe we covered it. Conditionals in the numbered parts ("what happens to the new current message") may warrant splitting rows or columns later.

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