Many-to-many object relation / multiselect in tag mode: support drag & drop to change order of assigned items

[BlackbitDevs]

Assume we have a many-to-many object relation in display mode = tag field.

When assigning new objects, everything works great but sometimes the order of the assigned items matters and you want to insert an item in between or change the order of already assigned items.
So if you have assigned objects /one and /three and now want to insert /two in between, then you have to currently

1. delete assignment for/three
2. assign /two
3. assign /three

This is quite complicated. And depending on number of assigned elements, this is can be even more work.

This PR adds drag & drop support for the assigned items. It works like in https://fiddle.sencha.com/fiddle/i65/preview
With this you can change the order of assigned objects afterwards.

The same functionality has also been applied to multiselect fields in tag mode.

[sonarcloud]

Quality Gate passed

Issues
22 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
6.3% Duplication on New Code

See analysis details on SonarCloud

[robertSt7]

Hi @BlackbitDevs could you please replace var with let and const? Thanks

[BlackbitDevs]

@robertSt7 Done.

[sonarcloud]

Quality Gate passed

Issues
22 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[fashxp]

We don't want to be picky, but we need to be careful with compliance and copyrights.

So, I'm sorry, we cannot merge this PR, as it includes code from a foreign author that has not signed our CLA.
Options to continue:

• rewrite that piece of code that it is your own work
• get permission of the original author

[BlackbitDevs]

@adamborowski is the code in https://fiddle.sencha.com/fiddle/i65/preview from you? Would it be ok to use it in Pimcore?

[adamborowski]

@adamborowski is the code in https://fiddle.sencha.com/fiddle/i65/preview from you? Would it be ok to use it in Pimcore?

Sure

[BlackbitDevs]

@fashxp Is above comment enough?

[fashxp]

yes it is, thx very much @adamborowski. maybe we can translate the comments to english, test once more then it is ready to merge.

[BlackbitDevs]

Have translated the comments.

[sonarcloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[mcop1]

Thanks, looks good to me.