Support Variant content migration (v8 -> v10+)

[KevinJump]

At the moment we don't support migrating variant content - which is only a convert issue

The migrator(s) have been built (at the moment) to convert the content values

<pageTitle>
      <Value><![CDATA[Page Title]]></Value>
</pageTitle>

but in v8+ content might have multiple values :

<pageTitle>
      <Value Culture="cy"><![CDATA[Welsh Page]]></Value>
      <Value Culture="en-us"><![CDATA[Page Title]]></Value>
</pageTitle>

So we need to change the logic a bit to cope with their being multiple values.

In theory its simple enough but the edge cases make it a bit of an intelectual challenge.

there are splittng and merging migratiors that may take a single value

<complexProperty>
      <Value><![CDATA[[{"one": "one", "two": "two"]]>></Value>
</complexProperty>

and make it

<propertyOne>
      <Value><![CDATA[[One]]>></Value>
</propertyOne>
<propertyTwo>
      <Value><![CDATA[[Two]]>></Value>
</propertyTwo>

so with multple values these get complex.

now they are super rare, and at the moment there might not be any of these for a v8 to v10 site, so we could just say the splitters and mergers will work as they do but won't support multi-lingual, but for normal properties we do support multilingual

and just fix the core case ?

anyway - up for grabs.

this in the sharedContentBaeHandler : https://github.com/Jumoo/uSyncMigrations/blob/main/uSync.Migrations/Handlers/Shared/SharedContentBaseHandler.cs#L120-L163

likely needs splitting up a bit with somebits going into the v8 sharedContentBase handler ??
https://github.com/Jumoo/uSyncMigrations/blob/main/uSync.Migrations/Handlers/Eight/ContentBaseMigrationHandler.cs

[CodingDK]

Hello @KevinJump

I have made a working solution for the culture variant issue here: CodingDK@5faaf22
I know it may not be the most beautiful solution - but it solved my problem. :-)

I've also made some other fixes that might be worth looking at.
https://github.com/CodingDK/uSyncMigrations/commits/main
Feel free to take a look and let me know if you have any questions