Bug 1276607 - Activate content frame when stopping RDM to restore focus. r=bigben

MozReview-Commit-ID: CgDxa0aaQwi

--HG--
extra : rebase_source : 2c637372142e83641bf9977916097a38f7d57ba3

devtools/client/responsive.html/browser/swap.js

@@ -128,6 +128,11 @@ function swapToInnerBrowser({ tab, containerURL, getInnerBrowser }) {
       //    `swapBrowsersAndCloseOther`.
       gBrowser.swapBrowsersAndCloseOther(tab, contentTab);
       gBrowser = null;
+
+      // The focus manager seems to get a little dizzy after all this swapping.  If a
+      // content element had been focused inside the viewport before stopping, it will
+      // have lost focus.  Activate the frame to restore expected focus.
+      tab.linkedBrowser.frameLoader.activateRemoteFrame();
     },
 
   };