feat(cdk/drag-drop): custom drag clone target

[geometricpanda]

By default the drag directive clones the element it's applied to and appends to
the end of body. This change allows for a selector, HTML element, or an ElementRef
to be provided for the clone to be appended to instead.

Closes #20536 #13288

[geometricpanda]

@crisbeto hows this looking for you?

[crisbeto]

Looks good, but there are some places that still refer to the parent value.

[geometricpanda]

Looks good, but there are some places that still refer to the parent value.

Ah, the MD file!
Not sure why but there was a strange caching issue happening on my local machine - probably a dodgy webstorm plugin.

I've fixed that now, the only references to parent left in the code are completely unrelated to the PR.

Thank you for all your help on this btw

[crisbeto]

LGTM. Thank you for the contribution!

[annieyw]

@geometricpanda please rebase when possible

[geometricpanda]

@annieyw couldnt rebase as i cant get to my dev laptop until after UK lockdown, had to use the github merge tools which created a merge commit, hope that's ok?

[wagnermaciel]

@geometricpanda One of your commit messages is not correctly formatted. If possible, please reword the invalid commit message

[geometricpanda]

@geometricpanda One of your commit messages is not correctly formatted. If possible, please reword the invalid commit message

@wagnermaciel

it was having an issue with the github merge commit, now i've finally got my dev laptop back i've been able to rebase so fingers crossed it should be ok now?

[AlecDusheck]

Any updates on this PR? It would be nice since I'm having styling issues

[geometricpanda]

Any updates on this PR? It would be nice since I'm having styling issues

There's been some major changes been merged into the way the drag container is being handled in the CDK which means this mechanism is no longer going to work I fear :-(

[crisbeto]

@geometricpanda I don't think anything fundamentally changed in the module, but there were definitely some changes that could've caused merge conflicts. Do you intend on reopening this or should I pick up the feature request?

[crisbeto]

I ended up re-implementing this myself in #21830. I also added support for parent which was omitted here.

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