[TYPO3-core] RFC #8635: MM-relations lost during copying/localizing

[Ernesto Baschny [cron IT]]

This is an SVN patch request.

Type: Bugfix

Bugtracker references: http://bugs.typo3.org/view.php?id=8635

Branches: TYPO3_4-2, trunk

Problem:
Copying (or localizing) records with MM-relations to other database 
tables will not copy over the  MM-field contents (the relations). 
Instead you will probably get an error like:

"102: These fields are not properly updated in database: (category) 
Probably value mismatch with fieldtype."

This might happen for example when copying an tt_news record with 
categories. The categories assigned to the element are not copied, which 
is pretty critical.

The bug might affect other areas on copy/localize (e.g. flexforms, like 
someone reported in the -dev list some days ago).


Solution:
The origin of the bug is a patch introduced for fixing the problem with 
shifting datetime on copy:

http://forge.typo3.org/repositories/diff/typo3v4-core?rev=3735

This turned off any transformation/processing on copy/localize, which 
turns out to be wrong, at least for MM-relations (might be the case for 
other transformations as well).

The solution is to first reverse the above listed patch and then have 
the fix applied only to the very specific timezone shifting 
transformation to fix that problem, which is what the attached patch does.


Note:
this is pretty critical for inclusion before 4.2.1 release!

Thanks for Matthias Glatt for reporting this.


Cheers,
Ernesto


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