Git commits in Moodle 3.8.3 by Alexander Bias

commit eaf3679e08a1e51dc4724763604e4c4e8e75caf0
Author: Alexander Bias <alexander.bias@uni-ulm.de>
Date:   Tue, 24 Mar 2020 04:36:13 +0800
Tag:    v3.8.3

MDL-58964 navigation: Reindex array when element is removed


commit cf0270260bc66f07042ab2c765380aab2a0441da
Author: Alexander Bias <alexander.bias@uni-ulm.de>
Date:   Fri, 20 Mar 2020 03:48:38 +0800
Tag:    v3.8.3

MDL-58964 navigation: Add class attributes to Boost flat navigation