Sortable: Connected list placeholders have an inaccurate initial position

[dylanpyle]

Hey folks,

I'm running into an issue with jQuery-UI 1.10.3 (+ jQuery 2.0.2) regarding the behavior of connected sortable lists.

Reduced test case at: ​http://jsfiddle.net/VNZW8/

Expected behavior: When dragging an element from the sidebar to the main content area, the initial placeholder and subsequent drop point is below the existing items if appropriate.

Observed behavior: The placeholder always initially appears at the top of the receiving list prior to any existing items, unless the mouse is moved to the top of the list then back down again.

I'm seeing this behavior in Chrome 27 and Firefox 21, and have no reason to suspect it's browser-dependent.

This issue is not present in UI 1.9.2 (+ jQuery 1.9.1), which implies it's a recent regression.

Happy to clarify if there's any additional questions.

[dylanpyle]

Update for clarification, here's what I'm seeing vs. what I'd expect to see:

​http://f.cl.ly/items/3v1s3w1z1a1t0v0H4743/actual.png ​http://f.cl.ly/items/2x2q1u2m0n3G2K330W2p/expected.png

[tj.vantoll]

Duplicate of #9314.

[tj.vantoll]

Likely has the same root cause as #9314.

[Kris Borchers]

Sortable: Adjust itemWithLeastDistance algorithm in _contactContainers to properly handle dragging items to the beginning and ends of lists. Fixes #9314 - Sortable: Items cannot be dragged directly into bottom position. Fixes #9381 - Sortable: Connected list placeholders have an inaccurate initial position

Changeset: 601ad962e0a417bb369378ed7704a0b493eac365