jQuery.fn.is returns incorrect result if used to check $(this) or $(e.currentTarget) and a positional pseudoselector is used

[garnwraly@…]

This fiddle is the most reduced that shows the error: ​http://jsfiddle.net/garnwraly/sfrwU/21/

This fiddle shows why :first-child isn't suitable sometimes: ​http://jsfiddle.net/garnwraly/sfrwU/26/

This fiddle shows a workaround, apparently it works correctly if you pass a jQuery object into is instead of a selector. ​http://jsfiddle.net/XAKLP/

[garnwraly@…]

problem isolated by ryanbrill to be due to the context being set from document to the element is is being called from.

Can be worked around by writing $(e.currentTarget).parent().is.call(document, 'selector:first') instead of $(e.currentTarget).parent().is('selector:first')

Fiddle: ​http://jsfiddle.net/garnwraly/sfrwU/30/

Stackoverflow post: ​http://stackoverflow.com/a/16115841/482053

[Richard Gibson]

Fix #13797: .is with single-node context (cherry picked from commit 4f786ba4d2a5544cb48f589d2659d6cab84efc34)

Changeset: fb1731ab163424e22bac4372f15cda1195bfaa85

[gibson042]

This ticket is now resolved, but I ​strongly recommend against sending positional selectors to .is. Please consider something with more obvious behavior, like using jQuery( positionalSelector ).is( e.currentTarget ) directly (reversing the context and argument).