Bug 1540601 - Ensuring that TreeView filtering works with keyboard. r=nchevobbe

Differential Revision: https://phabricator.services.mozilla.com/D25552

devtools/client/shared/components/tree/TreeView.js

@@ -546,7 +546,20 @@ define(function(require, exports, module) {
           member: member,
           columns: this.state.columns,
           id: member.path,
-          ref: row => row && this.rows.push(row),
+          ref: row => {
+            if (!row) {
+              return;
+            }
+
+            const rowEl = findDOMNode(row);
+            if (!rowEl || !rowEl.offsetParent) {
+              // offsetParent returns null when the element has style.display
+              // set to none (done by TreeView filtering).
+              return;
+            }
+
+            this.rows.push(row);
+          },
           onClick: this.onClickRow.bind(this, member.path),
           onContextMenu: this.onContextMenu.bind(this, member),
         });