Immediately deactivate remarkup autocomplete if there's no query

Summary:
Fixes T12479. If you end a line with a character like ":" in a context which can trigger autocomplete (e.g., `.:`), then try to make a newline, we swallow the keystroke.

Instead, allow the keystroke through if the user hasn't typed anything else yet.

Test Plan:
  - Autocompleted emoji and users normally.
  - In an empty textarea, typed `.:<return>`, got a newline instead of a swallowed keystroke.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12479

Differential Revision: https://secure.phabricator.com/D17583

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' => 'b3465b9b',
-    'rsrc/js/phuix/PHUIXAutocomplete.js' => '7910aacb',
+    'rsrc/js/phuix/PHUIXAutocomplete.js' => 'd5b2abf3',
     'rsrc/js/phuix/PHUIXDropdownMenu.js' => '8018ee50',
     'rsrc/js/phuix/PHUIXFormControl.js' => '83e03671',
     'rsrc/js/phuix/PHUIXIconView.js' => 'bff6884b',
@@ -885,7 +885,7 @@ return array(
     'phui-workpanel-view-css' => 'a3a63478',
     'phuix-action-list-view' => 'b5c256b8',
     'phuix-action-view' => 'b3465b9b',
-    'phuix-autocomplete' => '7910aacb',
+    'phuix-autocomplete' => 'd5b2abf3',
     'phuix-dropdown-menu' => '8018ee50',
     'phuix-form-control-view' => '83e03671',
     'phuix-icon-view' => 'bff6884b',
@@ -1456,12 +1456,6 @@ return array(
       'multirow-row-manager',
       'javelin-json',
     ),
-    '7910aacb' => array(
-      'javelin-install',
-      'javelin-dom',
-      'phuix-icon-view',
-      'phabricator-prefab',
-    ),
     '7927a7d3' => array(
       'javelin-behavior',
       'javelin-quicksand',
@@ -2053,6 +2047,12 @@ return array(
       'javelin-uri',
       'phabricator-notification',
     ),
+    'd5b2abf3' => array(
+      'javelin-install',
+      'javelin-dom',
+      'phuix-icon-view',
+      'phabricator-prefab',
+    ),
     'd6a7e717' => array(
       'multirow-row-manager',
       'javelin-install',

webroot/rsrc/js/phuix/PHUIXAutocomplete.js

@@ -433,6 +433,16 @@ JX.install('PHUIXAutocomplete', {
         }
       }
 
+      // Deactivate if the user moves the cursor to the left of the assist
+      // range. For example, they might press the "left" arrow to move the
+      // cursor to the left, or click in the textarea prior to the active
+      // range.
+      var range = JX.TextAreaUtils.getSelectionRange(area);
+      if (range.start < this._cursorHead) {
+        this._deactivate();
+        return;
+      }
+
       if (special == 'tab' || special == 'return') {
         var r = e.getRawEvent();
         if (r.shiftKey && special == 'tab') {
@@ -443,6 +453,15 @@ JX.install('PHUIXAutocomplete', {
           return;
         }
 
+        // If the user hasn't typed any text yet after typing the character
+        // which can summon the autocomplete, deactivate and let the keystroke
+        // through. For example, We hit this when a line ends with an
+        // autocomplete character and the user is trying to type a newline.
+        if (range.start == this._cursorHead) {
+          this._deactivate();
+          return;
+        }
+
         // If we autocomplete, we're done. Otherwise, just eat the event. This
         // happens if you type too fast and try to tab complete before results
         // load.
@@ -454,16 +473,6 @@ JX.install('PHUIXAutocomplete', {
         return;
       }
 
-      // Deactivate if the user moves the cursor to the left of the assist
-      // range. For example, they might press the "left" arrow to move the
-      // cursor to the left, or click in the textarea prior to the active
-      // range.
-      var range = JX.TextAreaUtils.getSelectionRange(area);
-      if (range.start < this._cursorHead) {
-        this._deactivate();
-        return;
-      }
-
       // Deactivate if the user moves the cursor to the right of the assist
       // range. For example, they might click later in the document. If the user
       // is pressing the "right" arrow key, they are not allowed to move the