[nautilus] file: use emblems for files that use default icon

[António Fernandes <antoniof src gnome org>]

commit 8efe35665368539de0e15f150292996cb0ab9121
Author: Colin Atkinson <colin atakama com>
Date:   Wed Aug 7 13:36:43 2019 -0400

    file: use emblems for files that use default icon
    
    Files that fall back on the statically-allocated default GIcon will not
    have emblems drawn on them. Create a new GIcon with emblems on it if
    needed, and document the circumstances that lead to this case being hit.
    
    Fixes https://gitlab.gnome.org/GNOME/nautilus/issues/1189

 src/nautilus-file.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)
---
diff --git a/src/nautilus-file.c b/src/nautilus-file.c
index 8d1fbb54c..45603af08 100644
--- a/src/nautilus-file.c
+++ b/src/nautilus-file.c
@@ -5327,10 +5327,31 @@ nautilus_file_get_icon (NautilusFile          *file,
         icon = nautilus_icon_info_lookup (gicon, size, scale);
         g_object_unref (gicon);
 
+        /* Files for which the MIME type cannot be determined will result in
+         * the icon being detected as a fallback. This is because the default
+         * theme does not have icons for the names corresponding to these file
+         * types. */
         if (nautilus_icon_info_is_fallback (icon))
         {
             g_object_unref (icon);
-            icon = nautilus_icon_info_lookup (get_default_file_icon (), size, scale);
+
+            gicon = get_default_file_icon ();
+
+            /* Increase ref count on gicon, even though it is statically
+             * allocated. This is needed because apply_emblems_to_icon
+             * decreases the ref count on the original icon it is given. */
+            g_object_ref (gicon);
+
+            if (flags & NAUTILUS_FILE_ICON_FLAGS_USE_EMBLEMS)
+            {
+                apply_emblems_to_icon (file, &gicon, flags);
+            }
+
+            icon = nautilus_icon_info_lookup (gicon, size, scale);
+
+            /* Decrease ref count on either the static default icon, or on the
+             * newly-created emblemed icon. */
+            g_object_unref (gicon);
         }
     }