[epiphany] location-entry: Add a FIXME comment

[Michael Catanzaro <mcatanzaro src gnome org>]

commit b3e1e73832231b79e6c6bb7405839edd61cfef03
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed Nov 14 14:57:51 2018 -0600

    location-entry: Add a FIXME comment

 lib/widgets/ephy-location-entry.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/lib/widgets/ephy-location-entry.c b/lib/widgets/ephy-location-entry.c
index 39b7c5493..d58ed0708 100644
--- a/lib/widgets/ephy-location-entry.c
+++ b/lib/widgets/ephy-location-entry.c
@@ -728,6 +728,8 @@ button_box_size_allocated_cb (GtkWidget    *widget,
    *    including border spacing 5).
    *  - progress margin-right is used to allow progress bar below icons on the
    *    right side.
+   *
+   * FIXME: Loading CSS during size_allocate is ILLEGAL and BROKEN.
    */
   css = g_strdup_printf (".url_entry { padding-right: %dpx; }"\
                          ".url_entry progress { margin-right: -%dpx; }",