21.1.5 update#2

friedcucumber merged 8 commits into21.1.5+DevExpress-Examples/wpf-dock-layout-manager-limit-layout-group-customization-at-runtime:21.1.5+from

21.1.5-updateDevExpress-Examples/wpf-dock-layout-manager-limit-layout-group-customization-at-runtime:21.1.5-updateCopy head branch name to clipboard