Stop defaults from being overwritten

[henrahmagix]

Commit message:

Stop $.extend overwriting defaults object.

When using $.extend, the first argument object is altered, and
since objects are copied by reference in Javascript that means the
defaults object gets changed when it shouldn't and subsequent
calls to $().sticky() will use previous options rather than fresh
defaults.

More info:

var defaults = {
  // defaults set in jquery.sticky.js
  topSpacing: 0,
  bottomSpacing: 0,
  className: 'is-sticky',
  wrapperClassName: 'sticky-wrapper',
  center: false,
  getWidthFrom: ''
};
console.log(defaults.center);
// false
var options = {
  // options passed in to $(element).sticky()
  center: true
};
$.extend(defaults, options)
console.log(defaults.center);
// true
// Subsequent sticky calls will be centered.

[henrahmagix]

@garand What do you think?

[garand]

Sounds good. Let's go for it.

[henrahmagix]

Thanks!

[garand]

I've really dropped the ball on maintaining this. 😞

[henrahmagix]

No worries, it happens to the best of us =)