Bug 1491874: Prevent raising the toolbox. r=jdescottes

Differential Revision: https://phabricator.services.mozilla.com/D40378

--HG--
extra : moz-landing-system : lando

devtools/client/definitions.js

@@ -160,6 +160,9 @@ Tools.inspector = {
   inMenu: true,
 
   preventClosingOnKey: true,
+  // preventRaisingOnKey is used to keep the focus on the content window for shortcuts
+  // that trigger the element picker.
+  preventRaisingOnKey: true,
   onkey: function(panel, toolbox) {
     toolbox.inspectorFront.nodePicker.togglePicker();
   },

devtools/client/framework/devtools-browser.js

@@ -293,7 +293,9 @@ var gDevToolsBrowser = (exports.gDevToolsBrowser = {
         toolDefinition.preventClosingOnKey ||
         toolbox.hostType == Toolbox.HostType.WINDOW
       ) {
-        toolbox.raise();
+        if (!toolDefinition.preventRaisingOnKey) {
+          toolbox.raise();
+        }
       } else {
         toolbox.destroy();
       }