Kendo Treeview Icons Missing in Document Map Area

Environment

Product Version	12.2.18.1017
Product	Progress® Telerik® Reporting
Viewer	HTML5 Viewer

Description

After updating to R3 2018 SP1 (12.2.18.1017), Kendo treeview icons disappeared.

Solution

The icons could appear again by adding the following styles to your project:

.k-treeview .k-plus:before,
.k-i-expand:before { content: "\e005"; }

.k-treeview .k-minus:before,
.k-i-collapse:before { content: "\e001"; }