Ensure that textgroup is added back when upgrading from d7

[herbdool]

Ensure that textgroup is added back when upgrading from d7

[indigoxela]

See also this meta issue for upgrade paths: #33

[indigoxela]

I think, several people did weird things over the years. What we actually should use is hook_schema_alter() - or am I missing something?

[herbdool]

Maybe, but I think hook_schema_alter only gets called on an install. Here we are doing it on an upgrade where it might already be installed.

[indigoxela]

Weird idea: we currently lose all data with locale_update_1000(). What if we clone the whole table before that hook and move back the table after that, so following locale update hooks run, but we keep all data?

[indigoxela]

I'd prefer to do these experiments on a branch: https://github.com/backdrop-contrib/i18n/tree/d7-upgrade-path

@herbdool what do you think?

This is the change

[indigoxela]

Branch d7-upgrade-path has been merged into 1.x-1.x, which addresses the textgroup problem.