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/*!
 * jQuery UI Mouse 1.14.2
 * https://jqueryui.com
 *
 * Copyright OpenJS Foundation and other contributors
 * Released under the MIT license.
 * https://jquery.org/license
 */

//>>label: Mouse
//>>group: Widgets
//>>description: Abstracts mouse-based interactions to assist in creating certain widgets.
//>>docs: https://api.jqueryui.com/mouse/

( function( factory ) {
	"use strict";

if ( typeof define === "function" && define.amd ) {

// AMD. Register as an anonymous module.
		define( [
			"jquery",
			"../version",
			"../widget"
		], factory );
	} else {

// Browser globals
		factory( jQuery );
	}
} )( function( $ ) {
"use strict";

var mouseHandled = false;
$( document ).on( "mouseup", function() {
	mouseHandled = false;
} );

return $.widget( "ui.mouse", {
	version: "1.14.2",
	options: {
		cancel: "input, textarea, button, select, option",
		distance: 1,
		delay: 0
	},
	_mouseInit: function() {
		var that = this;

this.element
			.on( "mousedown." + this.widgetName, function( event ) {
				return that._mouseDown( event );
			} )
			.on( "click." + this.widgetName, function( event ) {
				if ( true === $.data( event.target, that.widgetName + ".preventClickEvent" ) ) {
					$.removeData( event.target, that.widgetName + ".preventClickEvent" );
					event.stopImmediatePropagation();
					return false;
				}
			} );

this.started = false;
	},

// TODO: make sure destroying one instance of mouse doesn't mess with
	// other instances of mouse
	_mouseDestroy: function() {
		this.element.off( "." + this.widgetName );
		if ( this._mouseMoveDelegate ) {
			this.document
				.off( "mousemove." + this.widgetName, this._mouseMoveDelegate )
				.off( "mouseup." + this.widgetName, this._mouseUpDelegate );
		}
	},

_mouseDown: function( event ) {

// don't let more than one widget handle mouseStart
		if ( mouseHandled ) {
			return;
		}

this._mouseMoved = false;

// We may have missed mouseup (out of window)
		if ( this._mouseStarted ) {
			this._mouseUp( event );
		}

this._mouseDownEvent = event;

var that = this,
			btnIsLeft = event.which === 1,
			elIsCancel = typeof this.options.cancel === "string" ?
				$( event.target ).closest( this.options.cancel ).length :
				false;
		if ( !btnIsLeft || elIsCancel || !this._mouseCapture( event ) ) {
			return true;
		}

this.mouseDelayMet = !this.options.delay;
		if ( !this.mouseDelayMet ) {
			this._mouseDelayTimer = setTimeout( function() {
				that.mouseDelayMet = true;
			}, this.options.delay );
		}

if ( this._mouseDistanceMet( event ) && this._mouseDelayMet( event ) ) {
			this._mouseStarted = ( this._mouseStart( event ) !== false );
			if ( !this._mouseStarted ) {
				event.preventDefault();
				return true;
			}
		}

// Click event may never have fired (Gecko & Opera)
		if ( true === $.data( event.target, this.widgetName + ".preventClickEvent" ) ) {
			$.removeData( event.target, this.widgetName + ".preventClickEvent" );
		}

// These delegates are required to keep context
		this._mouseMoveDelegate = function( event ) {
			return that._mouseMove( event );
		};
		this._mouseUpDelegate = function( event ) {
			return that._mouseUp( event );
		};

this.document
			.on( "mousemove." + this.widgetName, this._mouseMoveDelegate )
			.on( "mouseup." + this.widgetName, this._mouseUpDelegate );

event.preventDefault();

mouseHandled = true;
		return true;
	},

_mouseMove: function( event ) {

// Only check for mouseups outside the document if you've moved inside the document
		// at least once.
		if ( this._mouseMoved && !event.which ) {

// Support: Safari <=8 - 9
			// Safari sets which to 0 if you press any of the following keys
			// during a drag (#14461)
			if ( event.originalEvent.altKey || event.originalEvent.ctrlKey ||
					event.originalEvent.metaKey || event.originalEvent.shiftKey ) {
				this.ignoreMissingWhich = true;
			} else if ( !this.ignoreMissingWhich ) {
				return this._mouseUp( event );
			}
		}

if ( event.which || event.button ) {
			this._mouseMoved = true;
		}

if ( this._mouseStarted ) {
			this._mouseDrag( event );
			return event.preventDefault();
		}

if ( this._mouseDistanceMet( event ) && this._mouseDelayMet( event ) ) {
			this._mouseStarted =
				( this._mouseStart( this._mouseDownEvent, event ) !== false );
			if ( this._mouseStarted ) {
				this._mouseDrag( event );
			} else {
				this._mouseUp( event );
			}
		}

return !this._mouseStarted;
	},

_mouseUp: function( event ) {
		this.document
			.off( "mousemove." + this.widgetName, this._mouseMoveDelegate )
			.off( "mouseup." + this.widgetName, this._mouseUpDelegate );

if ( this._mouseStarted ) {
			this._mouseStarted = false;

if ( event.target === this._mouseDownEvent.target ) {
				$.data( event.target, this.widgetName + ".preventClickEvent", true );
			}

this._mouseStop( event );
		}

if ( this._mouseDelayTimer ) {
			clearTimeout( this._mouseDelayTimer );
			delete this._mouseDelayTimer;
		}

this.ignoreMissingWhich = false;
		mouseHandled = false;
		event.preventDefault();
	},

_mouseDistanceMet: function( event ) {
		return ( Math.max(
				Math.abs( this._mouseDownEvent.pageX - event.pageX ),
				Math.abs( this._mouseDownEvent.pageY - event.pageY )
			) >= this.options.distance
		);
	},

_mouseDelayMet: function( /* event */ ) {
		return this.mouseDelayMet;
	},

// These are placeholder methods, to be overriden by extending plugin
	_mouseStart: function( /* event */ ) {},
	_mouseDrag: function( /* event */ ) {},
	_mouseStop: function( /* event */ ) {},
	_mouseCapture: function( /* event */ ) {
		return true;
	}
} );

} );

Editing: mouse.js

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