Fix primefaces#3246 by adding a ui-treenode-content-selected class to…

… the ui-treenode-content div when a node is selected.

This allows someone to style the entire node div, not just the internal span, when a node is selected.

src/app/components/tree/tree.ts

@@ -42,7 +42,7 @@ export class TreeNodeTemplateLoader implements OnInit, OnDestroy {
             <li class="ui-treenode {{node.styleClass}}" *ngIf="!tree.horizontal" [ngClass]="{'ui-treenode-leaf': isLeaf()}">
                 <div class="ui-treenode-content" (click)="onNodeClick($event)" (contextmenu)="onNodeRightClick($event)" (touchend)="onNodeTouchEnd()"
                     (drop)="onDropNode($event)" (dragover)="onDropNodeDragOver($event)" (dragenter)="onDropNodeDragEnter($event)" (dragleave)="onDropNodeDragLeave($event)"
-                    [ngClass]="{'ui-treenode-selectable':tree.selectionMode && node.selectable !== false,'ui-treenode-dragover':draghoverNode}" [draggable]="tree.draggableNodes" (dragstart)="onDragStart($event)" (dragend)="onDragStop($event)">
+                    [ngClass]="{'ui-treenode-selectable':tree.selectionMode && node.selectable !== false,'ui-treenode-dragover':draghoverNode, 'ui-treenode-content-selected':isSelected()}" [draggable]="tree.draggableNodes" (dragstart)="onDragStart($event)" (dragend)="onDragStop($event)">
                     <span class="ui-tree-toggler  fa fa-fw" [ngClass]="{'fa-caret-right':!node.expanded,'fa-caret-down':node.expanded}"
                             (click)="toggle($event)"></span
                     ><div class="ui-chkbox" *ngIf="tree.selectionMode == 'checkbox'"><div class="ui-chkbox-box ui-widget ui-corner-all ui-state-default">