Show ancestor path for sub-projects and milestones.

To understand better to what projects a sub-project or
milestone belongs show the entire ancestor path.

Solves part of T69306.

Differential Revision: https://developer.blender.org/D5656

src/applications/project/typeahead/PhabricatorProjectDatasource.php

@@ -105,6 +105,18 @@ final class PhabricatorProjectDatasource
 
       $all_strings = array();
 
+      // Figure out the ancestors for this project
+      // so that we can prepend that to the display name.
+      $ancestors = array_reverse($proj->getAncestorProjects());
+      $ancestor_strings = array();
+      foreach ($ancestors as $ancestor) {
+        $ancestor_strings[] = $ancestor->getName();
+      }
+      $ancestor_strings = implode(' > ', $ancestor_strings);
+      if (strlen($ancestor_strings) > 0) {
+        $ancestor_strings = $ancestor_strings.' > ';
+      }
+
       // NOTE: We list the project's name first because results will be
       // sorted into prefix vs content phases incorrectly if we don't: it
       // will look like "Parent (Milestone)" matched "Parent" as a prefix,
@@ -123,7 +135,7 @@ final class PhabricatorProjectDatasource
 
       $proj_result = id(new PhabricatorTypeaheadResult())
         ->setName($all_strings)
-        ->setDisplayName($proj->getDisplayName())
+        ->setDisplayName($ancestor_strings.$proj->getDisplayName())
         ->setDisplayType($proj->getDisplayIconName())
         ->setURI($proj->getURI())
         ->setPHID($phid)