All: Migrate away from deprecated/removed Core APIs

Summary of the changes:

* Build: Add jQuery 3.2.0-3.4.1 to versions UI can be tested against
* Build: Load jQuery & Migrate via HTTPS
* Build: Add package-lock.json to .gitignore
* Build: Update jQuery Migrate from 3.0.0 to 3.1.0
* Build: Allow to run tests against jQuery 3.x-git
* Build: Fix formatting according to JSCS rules
* Build: Disable JSCS for the inlined jQuery Color
* All: Switch from $.isArray to Array.isArray (jQuery.isArray will be
  removed in jQuery 4.0)
* All: Switch from `$.isFunction( x )` to `typeof x === "function"`
  (jQuery.isFunction will be removed in jQuery 4.0)
* All: Inline jQuery.isWindow as it'll be removed in jQuery 4.0
* Effects: Fix a timing issue in a variable declaration. Previously,
  a jQuery object was created, chained & assigned to a variable that
  was then accessed in a callback used inside of this chained
  definition. Due to a timing difference in when the callback fired for
  the first time in latest jQuery master, it was being called before
  the variable was defined.
* Tests: Make dialog & draggable unit tests less strict (newest jQuery
  returns fractional results in some cases, making comparisons fail when
  there's a tiny difference)
* All: Migrate from $.trim to bare String.prototype.trim (jQuery.trim
  will be deprecated in jQuery 3.5)

Closes gh-1901

1 files changed, 1 insertions, 1 deletions

diff --git a/ui/widgets/resizable.js b/ui/widgets/resizable.js
index 36dd12514..cb0b1b11d 100644
--- a/ui/widgets/resizable.js
+++ b/ui/widgets/resizable.js
@@ -261,7 +261,7 @@ $.widget( "ui.resizable", $.ui.mouse, {
 
 			for ( i = 0; i < n.length; i++ ) {
 
-				handle = $.trim( n[ i ] );
+				handle = String.prototype.trim.call( n[ i ] );
 				hname = "ui-resizable-" + handle;
 				axis = $( "<div>" );
 				this._addClass( axis, "ui-resizable-handle " + hname );