Parse backslash as directory separator in breadcrumb

This will parse backslashes as directory separators in breadcrumbs. Thus when accessing something like `/index.php/apps/files?dir=foo\foo` the breadcrumb will properly resolve this instead of showing `foo\foo`

Fixes https://github.com/owncloud/core/issues/13643

apps/files/js/breadcrumb.js

@@ -67,6 +67,7 @@
 		 * @param dir path to be displayed as breadcrumb
 		 */
 		setDirectory: function(dir) {
+			dir = dir.replace(/\\/g, '/');
 			dir = dir || '/';
 			if (dir !== this.dir) {
 				this.dir = dir;

apps/files/tests/js/breadcrumbSpec.js

@@ -93,6 +93,31 @@ describe('OCA.Files.BreadCrumb tests', function() {
 			expect($crumbs.eq(3).find('img').length).toEqual(0);
 			expect($crumbs.eq(3).attr('data-dir')).toEqual('/somedir/with space/abc');
 		});
+		it('Renders backslashes as regular directory separator', function() {
+			var $crumbs;
+			bc.setDirectory('/somedir\\with/mixed\\separators');
+			$crumbs = bc.$el.find('.crumb');
+			expect($crumbs.length).toEqual(5);
+			expect($crumbs.eq(0).find('a').attr('href')).toEqual('/#0');
+			expect($crumbs.eq(0).find('img').length).toEqual(1);
+			expect($crumbs.eq(0).attr('data-dir')).toEqual('/');
+
+			expect($crumbs.eq(1).find('a').attr('href')).toEqual('/somedir#1');
+			expect($crumbs.eq(1).find('img').length).toEqual(0);
+			expect($crumbs.eq(1).attr('data-dir')).toEqual('/somedir');
+
+			expect($crumbs.eq(2).find('a').attr('href')).toEqual('/somedir/with#2');
+			expect($crumbs.eq(2).find('img').length).toEqual(0);
+			expect($crumbs.eq(2).attr('data-dir')).toEqual('/somedir/with');
+
+			expect($crumbs.eq(3).find('a').attr('href')).toEqual('/somedir/with/mixed#3');
+			expect($crumbs.eq(3).find('img').length).toEqual(0);
+			expect($crumbs.eq(3).attr('data-dir')).toEqual('/somedir/with/mixed');
+
+			expect($crumbs.eq(4).find('a').attr('href')).toEqual('/somedir/with/mixed/separators#4');
+			expect($crumbs.eq(4).find('img').length).toEqual(0);
+			expect($crumbs.eq(4).attr('data-dir')).toEqual('/somedir/with/mixed/separators');
+		});
 	});
 	describe('Events', function() {
 		it('Calls onClick handler when clicking on a crumb', function() {