Bug 1461366 - Focus the Browser Console window after opening;r=nchevobbe

This allows keyboard shortcuts to work right away when the input field
isn't present.

MozReview-Commit-ID: COmmybkUu0m

--HG--
extra : rebase_source : 1e40fc7be3e97b990b1b3839482618eb9b7f166b

devtools/client/webconsole/new-webconsole.js

@@ -241,6 +241,10 @@ NewWebConsoleFrame.prototype = {
     shortcuts.on(clearShortcut, () => this.jsterm.clearOutput(true));
 
     if (this.isBrowserConsole) {
+      // Make sure keyboard shortcuts work immediately after opening
+      // the Browser Console (Bug 1461366).
+      this.window.focus();
+
       shortcuts.on(l10n.getStr("webconsole.close.key"),
                    this.window.top.close.bind(this.window.top));
 

devtools/client/webconsole/test/mochitest/browser_console_open_or_focus.js

@@ -20,6 +20,8 @@ add_task(async function() {
 
   hud = HUDService.getBrowserConsole();
 
+  ok(hud.ui.document.hasFocus(), "Focus in the document");
+
   console.log(TEST_MESSAGE);
 
   await waitFor(() => findMessage(hud, TEST_MESSAGE));