[gnome-builder] grep: Don't show project tree Find in Files menu items when unavailable

[Christian Hergert <chergert src gnome org>]

commit 48054f833ef7e5f8b6a9594398bbd19955f74eaa
Author: vanadiae <vanadiae35 gmail com>
Date:   Tue Jul 20 19:28:51 2021 +0200

    grep: Don't show project tree Find in Files menu items when unavailable
    
    Currently it shows even with the VCS/Build/Tests project tree section.
    So do like all other menu items and use hidden-when=action-disabled.

 src/plugins/grep/gtk/menus.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/plugins/grep/gtk/menus.ui b/src/plugins/grep/gtk/menus.ui
index c9d8db92d..c035a1acb 100644
--- a/src/plugins/grep/gtk/menus.ui
+++ b/src/plugins/grep/gtk/menus.ui
@@ -3,6 +3,7 @@
   <menu id="project-tree-menu">
     <section id="project-tree-menu-placeholder2">
       <item>
+        <attribute name="hidden-when">action-disabled</attribute>
         <attribute name="label" translatable="yes">_Find in Files</attribute>
         <attribute name="action">grep.find-in-files</attribute>
       </item>