[bug report] copy, copySortSource, two way binding, phantom elements

[farafonoff]

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Change each [ ] to [x] when you have done it.

• [x] My issue title starts with [bug report]
• [x] I have read the README, especially the 'classic blunders' section, and the dragula docs.
• [x] I have searched through the ng2-dragula issues for related problems, including closed issues.
• [x] I have browsed through the issues labeled "future reference" for problems that have been solved before or have a known workaround.
• [x] I am using the latest version of ng2-dragula.

Describe the bug (required)

create dragula group using options: { copy: true, accepts: true, copySortSource: true, copyItem: (item) => ({...item}) } and attach some array as ([dragulaModel])="this.list", with ngFor inside. To Reproduce (required)

Steps to reproduce the behavior:

1. try adding two or more elements to list
2. try dragging bottom element up
3. see broken list.

https://ng2-dragula-base-txj2v1.stackblitz.io

Screenshots (optional)

If applicable, add screenshots to help explain your problem.

Versions (required)

Please state which versions of the following packages you have installed:

• @angular/core: any: reproducible for 5.2.4 and 7.0.0
• ng2-dragula: [2.1.1]

[mgurnani]

+1. I am also seeing the same issue. When dragging and dropping elements backwards, the list is broken..

[edoardoo]

Same problem here.

[cormacrelf]

I don’t know how to make copySortSource work. There is an example on the demos page that completely replicates its functionality, however. Just use that. (Edit: maybe not, but the feature has never worked, so it's nothing new.)

[philoxenberg]

I have a similar issue. Sometimes it works perfectly, but dragging up sometimes creates a duplicate, sometimes items disappear.

[murilo8812]

same problem here, any workarround?

[philostow1]

Not that I have found