$.ui.mouse.defaults never used

in ui.core.js , $.ui.mouse.defaults are defined but never used. The ui components that use $.ui.mouse (draggable, resizeable, etc.) define their own cancel, delay and distance options.

This is mostly just wasted bytes (the functions work with the options undefined), but is a problem for _mouseMove, which uses _mouseDistanceMet, which requires a non-zero value for distance. A widget that does not define distance will never trigger _mouseDrag.

Quick fix: eliminate $.ui.mouse.defaults entirely and make _mouseDistanceMet work with distance === undefined by reversing the condition:

return !(Math.max(...) < this.options.distance)

(any comparision with undefined returns false)