fix auto-animate bug on centered slides

examples/auto-animate.html

@@ -162,12 +162,13 @@
 
 		</div>
 
-		<script src="../dist/reveal.es5.js"></script>
+		<script src="../dist/reveal.js"></script>
 		<script src="../dist/plugin/highlight.js"></script>
 		<script>
 			Reveal.initialize({
 				center: true,
-				hash: true
+				hash: true,
+				plugins: [ RevealHighlight ]
 			});
 		</script>
 

js/controllers/autoanimate.js

@@ -331,6 +331,8 @@ export default class AutoAnimate {
 	 */
 	getAutoAnimatableProperties( direction, element, elementOptions ) {
 
+		let config = this.Reveal.getConfig();
+
 		let properties = { styles: [] };
 
 		// Position and size
@@ -342,6 +344,12 @@ export default class AutoAnimate {
 			if( typeof elementOptions.measure === 'function' ) {
 				bounds = elementOptions.measure( element );
 			}
+			else {
+				if( config.center ) {
+					// More precise, but breaks when used in combination
+					// with zoom for scaling the deck ¯\_(ツ)_/¯
+					bounds = element.getBoundingClientRect();
+				}
 				else {
 					let scale = this.Reveal.getScale();
 					bounds = {
@@ -350,10 +358,7 @@ export default class AutoAnimate {
 						width: element.offsetWidth * scale,
 						height: element.offsetHeight * scale
 					};
-
-				// More precise, but breaks when used in combination
-				// with zoom for scaling the deck ¯\_(ツ)_/¯
-				// bounds = element.getBoundingClientRect();
+				}
 			}
 
 			properties.x = bounds.x;
@@ -365,7 +370,7 @@ export default class AutoAnimate {
 		const computedStyles = getComputedStyle( element );
 
 		// CSS styles
-		( elementOptions.styles || this.Reveal.getConfig().autoAnimateStyles ).forEach( style => {
+		( elementOptions.styles || config.autoAnimateStyles ).forEach( style => {
 			let value;
 
 			// `style` is either the property name directly, or an object