[gdk-pixbuf/wip/rishi/unbreak-thumbnailing-gifs] thumbnailer: Unbreak thumbnailing of GIFs

[Debarshi Ray <debarshir src gnome org>]

commit f59d1d177f641562f44915401577d22569ed2a8c
Author: Debarshi Ray <debarshir gnome org>
Date:   Wed Dec 12 18:57:27 2018 +0100

    thumbnailer: Unbreak thumbnailing of GIFs
    
    The GIF codec throws GDK_PIXBUF_ERROR_INCOMPLETE_ANIMATION if it's
    closed without decoding all the frames. The thumbnailer has always,
    both now with gdk_pixbuf_new_from_file_at_scale and earlier, decoded
    only the first animation frame, which is why this specific error needs
    to be ignored [1].
    
    Fixes: dd1f222f78eed2b7d70a5e8507199c78e3f9e12b
    
    [1] https://gitlab.gnome.org/GNOME/gnome-desktop/commit/f9b2c480e38d
    
    https://gitlab.gnome.org/GNOME/gdk-pixbuf/issues/99

 thumbnailer/gdk-pixbuf-thumbnailer.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/thumbnailer/gdk-pixbuf-thumbnailer.c b/thumbnailer/gdk-pixbuf-thumbnailer.c
index d50ede8ee..8308ecaf7 100644
--- a/thumbnailer/gdk-pixbuf-thumbnailer.c
+++ b/thumbnailer/gdk-pixbuf-thumbnailer.c
@@ -36,6 +36,14 @@ file_to_pixbuf (const char  *path,
        if (pixbuf == NULL)
                return NULL;
 
+       /* The GIF codec throws GDK_PIXBUF_ERROR_INCOMPLETE_ANIMATION
+        * if it's closed without decoding all the frames. Since
+        * gdk_pixbuf_new_from_file_at_size only decodes the first
+        * frame, this specific error needs to be ignored.
+        */
+       if (error != NULL && g_error_matches (*error, GDK_PIXBUF_ERROR, 
GDK_PIXBUF_ERROR_INCOMPLETE_ANIMATION))
+               g_clear_error (error);
+
        tmp_pixbuf = gdk_pixbuf_apply_embedded_orientation (pixbuf);
        gdk_pixbuf_copy_options (pixbuf, tmp_pixbuf);
        gdk_pixbuf_remove_option (tmp_pixbuf, "orientation");