Bug 1357340 - grid inspector: add isConnected when creating node grips from node fronts;r=gl

MozReview-Commit-ID: 3OUrS2OvqFs

--HG--
extra : rebase_source : b6fd122506d3b4bb4b7fa13c84600c21fd0d06c6

devtools/client/inspector/grids/components/GridItem.js

@@ -81,6 +81,8 @@ module.exports = createClass({
       preview: {
         attributes: attributesMap,
         attributesLength: attributes.length,
+        // All the grid containers are assumed to be in the DOM tree.
+        isConnected: true,
         // nodeName is already lowerCased in Node grips
         nodeName: nodeFront.nodeName.toLowerCase(),
         nodeType: nodeFront.nodeType,