Make the Ferret query compiler keep functions sticky across non-initial quoted tokens

Summary: Ref T13509. In `title:big "red" dog`, keep "title" sticky across all three terms, since this seems like it's probably the best match for intent.

Test Plan: Added unit tests; ran unit tests.

Maniphest Tasks: T13509

Differential Revision: https://secure.phabricator.com/D21111

src/applications/search/compiler/PhutilSearchQueryCompiler.php

@@ -358,7 +358,14 @@ final class PhutilSearchQueryCompiler
 
         $result['function'] = $function;
 
-        $is_sticky = !$result['quoted'];
+        // Note that the function remains sticky across quoted terms appearing
+        // after the function term. For example, all of these terms are title
+        // terms:
+        //
+        //   title:a "b c" d
+
+        $is_sticky = (!$result['quoted'] || ($token['function'] === null));
+
         switch ($operator) {
           case self::OPERATOR_ABSENT:
           case self::OPERATOR_PRESENT:

src/applications/search/compiler/__tests__/PhutilSearchQueryCompilerTestCase.php

@@ -185,6 +185,14 @@ final class PhutilSearchQueryCompilerTestCase
         array(null, $op_and, 'x'),
       ),
 
+      // Functions like "title:" continue to stick across quotes if the
+      // quotes aren't the initial argument.
+      'title:a "b c" d' => array(
+        array('title', $op_and, 'a'),
+        array('title', $op_and, 'b c'),
+        array('title', $op_and, 'd'),
+      ),
+
       // These queries require a field be both present and absent, which is
       // impossible.
       'title:- title:x' => false,