Sometime element make a "jump" after a drag&drop

[ghost]

I wanted to update from version 1.11.2 to latest version 1.12.9

After the update the transition was working well but sometime the element jump after dropping it.

Steps to reproduce the behavior:

1. Have list of sortable item.
2. Drag&drop any element to change the order.
3. Repeat step 2 until you see the item jump after dropping it.

See the video for more info about the bug in the .zip. bug-video.zip

While doing the update I got the bug mentioned in issue #234. So I added the css properties as recommended in the issue. I don't know if that could affect the behavior.

[lacek]

I've created an ember-twiddle as a demo for this: https://ember-twiddle.com/8f01f4387e8189188b1fcfe6b92fdd58

The "jump" occurs almost every time when I drag items upward.

Versions:

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