Resizable - setting handles option removes previous handles

[annam]

In jquery ui 1.12.1 it seems that when reinitializing resizable or changing the "handles" setting removes the previous handles because it assumes that they will be re-added

however if you use the object notation where you define existing DOM elements for the handles, these dom elements are removed and handles disappear

here is a jsfiddle replicating the scenario : ​https://jsfiddle.net/annam/2cg12b1j/

change the jquery ui include to 1.11.4 to see how it worked before

thanks! Anna

[Scott González]

In 278d1e1:

Resizable: Keep user defined handles on _setOption

Fixes #15084
Closes gh-1795