Fix username typeahead in Remarkup with German keyboard layout

Summary:
Ref T10252. The previous fix rPa8a9fddb0738 only works for macOS.
Under Windows the @ symbol is composed of AltGr+q. For Chrome and Edge the "AltGr" keypressEvent is like pressing the Control key and the Alt key at the same time.
This fix changes the condition in such a way, that this case (pressing Control and Alt at the same time) is not blocked.

Test Plan:
Testing for the issue:

 - Launch Windows 10, Select German Keyboard, Use latest Chrome (60)
 - Observe typing `@` does not trigger typeahead
 - Apply patch, retest, see typeahead.

Regression tested:

 - Windows 10, Chrome, Firefox, Edge
 - Mac OS, Chrome, Firefox, Safari
 - Keyboard layouts, English, French, German, Spanish

All tests passed

Reviewers: benwick, epriestley

Reviewed By: epriestley

Subscribers: epriestley

Maniphest Tasks: T10252

Differential Revision: https://secure.phabricator.com/D18269

resources/celerity/map.php

@@ -528,7 +528,7 @@ return array(
     'rsrc/js/phui/behavior-phui-tab-group.js' => '0a0b10e9',
     'rsrc/js/phuix/PHUIXActionListView.js' => 'b5c256b8',
     'rsrc/js/phuix/PHUIXActionView.js' => '442efd08',
-    'rsrc/js/phuix/PHUIXAutocomplete.js' => 'f6699267',
+    'rsrc/js/phuix/PHUIXAutocomplete.js' => '4b7430ab',
     'rsrc/js/phuix/PHUIXButtonView.js' => 'a37126bd',
     'rsrc/js/phuix/PHUIXDropdownMenu.js' => '8018ee50',
     'rsrc/js/phuix/PHUIXExample.js' => '68af71ca',
@@ -881,7 +881,7 @@ return array(
     'phui-workpanel-view-css' => 'a3a63478',
     'phuix-action-list-view' => 'b5c256b8',
     'phuix-action-view' => '442efd08',
-    'phuix-autocomplete' => 'f6699267',
+    'phuix-autocomplete' => '4b7430ab',
     'phuix-button-view' => 'a37126bd',
     'phuix-dropdown-menu' => '8018ee50',
     'phuix-form-control-view' => '83e03671',
@@ -1237,6 +1237,12 @@ return array(
       'javelin-util',
       'phabricator-shaped-request',
     ),
+    '4b7430ab' => array(
+      'javelin-install',
+      'javelin-dom',
+      'phuix-icon-view',
+      'phabricator-prefab',
+    ),
     '4c193c96' => array(
       'javelin-behavior',
       'javelin-uri',
@@ -2127,12 +2133,6 @@ return array(
       'javelin-util',
       'javelin-reactor',
     ),
-    'f6699267' => array(
-      'javelin-install',
-      'javelin-dom',
-      'phuix-icon-view',
-      'phabricator-prefab',
-    ),
     'f7fc67ec' => array(
       'javelin-install',
       'javelin-typeahead',

webroot/rsrc/js/phuix/PHUIXAutocomplete.js

@@ -199,7 +199,7 @@ JX.install('PHUIXAutocomplete', {
       // to press Alt to type characters like "@" on a German keyboard layout.
       // The cost of misfiring autocompleters is very small since we do not
       // eat the keystroke. See T10252.
-      if (r.metaKey || r.ctrlKey) {
+      if (r.metaKey || (r.ctrlKey && !r.altKey)) {
         return;
       }