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Editing: svg-painter.js

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/**
 * Attempt to re-color SVG icons used in the admin menu or the toolbar
 *
 * @output wp-admin/js/svg-painter.js
 */

window.wp = window.wp || {};

wp.svgPainter = ( function( $, window, document, undefined ) {
	'use strict';
	var selector, painter,
		colorscheme = {},
		elements = [];

$( function() {
		wp.svgPainter.init();
	});

return {
		init: function() {
			painter = this;
			selector = $( '#adminmenu .wp-menu-image, #wpadminbar .ab-item' );

painter.setColors();
			painter.findElements();
			painter.paint();
		},

setColors: function( colors ) {
			if ( typeof colors === 'undefined' && typeof window._wpColorScheme !== 'undefined' ) {
				colors = window._wpColorScheme;
			}

if ( colors && colors.icons && colors.icons.base && colors.icons.current && colors.icons.focus ) {
				colorscheme = colors.icons;
			}
		},

findElements: function() {
			selector.each( function() {
				var $this = $(this), bgImage = $this.css( 'background-image' );

if ( bgImage && bgImage.indexOf( 'data:image/svg+xml;base64' ) != -1 ) {
					elements.push( $this );
				}
			});
		},

paint: function() {
			// Loop through all elements.
			$.each( elements, function( index, $element ) {
				var $menuitem = $element.parent().parent();

if ( $menuitem.hasClass( 'current' ) || $menuitem.hasClass( 'wp-has-current-submenu' ) ) {
					// Paint icon in 'current' color.
					painter.paintElement( $element, 'current' );
				} else {
					// Paint icon in base color.
					painter.paintElement( $element, 'base' );

// Set hover callbacks.
					$menuitem.on( 'mouseenter', function() {
						painter.paintElement( $element, 'focus' );
					} ).on( 'mouseleave', function() {
						// Match the delay from hoverIntent.
						window.setTimeout( function() {
							painter.paintElement( $element, 'base' );
						}, 100 );
					} );
				}
			});
		},

paintElement: function( $element, colorType ) {
			var xml, encoded, color;

if ( ! colorType || ! colorscheme.hasOwnProperty( colorType ) ) {
				return;
			}

color = colorscheme[ colorType ];

// Only accept hex colors: #101 or #101010.
			if ( ! color.match( /^(#[0-9a-f]{3}|#[0-9a-f]{6})$/i ) ) {
				return;
			}

xml = $element.data( 'wp-ui-svg-' + color );

if ( xml === 'none' ) {
				return;
			}

if ( ! xml ) {
				encoded = $element.css( 'background-image' ).match( /.+data:image\/svg\+xml;base64,([A-Za-z0-9\+\/\=]+)/ );

if ( ! encoded || ! encoded[1] ) {
					$element.data( 'wp-ui-svg-' + color, 'none' );
					return;
				}

try {
					xml = window.atob( encoded[1] );
				} catch ( error ) {}

if ( xml ) {
					// Replace `fill` attributes.
					xml = xml.replace( /fill="(.+?)"/g, 'fill="' + color + '"');

// Replace `style` attributes.
					xml = xml.replace( /style="(.+?)"/g, 'style="fill:' + color + '"');

// Replace `fill` properties in `<style>` tags.
					xml = xml.replace( /fill:.*?;/g, 'fill: ' + color + ';');

xml = window.btoa( xml );

$element.data( 'wp-ui-svg-' + color, xml );
				} else {
					$element.data( 'wp-ui-svg-' + color, 'none' );
					return;
				}
			}

$element.attr( 'style', 'background-image: url("data:image/svg+xml;base64,' + xml + '") !important;' );
		}
	};

})( jQuery, window, document );

Editing: svg-painter.js

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