[gnome-builder] find-other-file: fix usage for IdeSearchButton

[Christian Hergert <chergert src gnome org>]

commit ddf4e265f15bd55c40e708f2b302d79cc866c52b
Author: Christian Hergert <chergert redhat com>
Date:   Tue Apr 30 14:08:31 2019 -0700

    find-other-file: fix usage for IdeSearchButton

 src/plugins/find-other-file/find_other_file.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/plugins/find-other-file/find_other_file.py b/src/plugins/find-other-file/find_other_file.py
index 26a92bd5d..05c5ec43c 100644
--- a/src/plugins/find-other-file/find_other_file.py
+++ b/src/plugins/find-other-file/find_other_file.py
@@ -110,7 +110,11 @@ class FindOtherFile(GObject.Object, Ide.WorkspaceAddin):
 
     def present_results(self, results, name):
         headerbar = self.workspace.get_header_bar()
-        search = Dazzle.gtk_widget_find_child_typed(headerbar, Ide.SearchEntry)
+
+        button = Dazzle.gtk_widget_find_child_typed(headerbar, Ide.SearchButton)
+        button.grab_focus()
+
+        search = button.get_entry()
         search.set_text('')
         search.set_model(results)
         search.grab_focus()