[gimp] app: fix drag'n drop viewable description.

[Jehan <jehanp src gnome org>]

commit cb731fd8730b1103526fb3ba6b8ab5bb140229f4
Author: Jehan <jehan girinstud io>
Date:   Sat Apr 4 00:57:40 2020 +0200

    app: fix drag'n drop viewable description.
    
    In GTK+3 GIMP, without a "width-chars" even short layer names (a few
    letters) were always ellipsized to nothingness with the "ellipsize"
    property.
    So add a reasonable prefered width char (which will be at most 10
    characters, less if the layer name is smaller).
    
    Also drop "xpad" property as this is now deprecated.

 app/widgets/gimpdnd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/app/widgets/gimpdnd.c b/app/widgets/gimpdnd.c
index b09f590dde..e4d867e824 100644
--- a/app/widgets/gimpdnd.c
+++ b/app/widgets/gimpdnd.c
@@ -1848,10 +1848,10 @@ gimp_dnd_get_viewable_icon (GtkWidget      *widget,
 
       label = g_object_new (GTK_TYPE_LABEL,
                             "label",           desc,
-                            "xpad",            3,
                             "xalign",          0.0,
                             "yalign",          0.5,
                             "max-width-chars", 30,
+                            "width-chars",     MIN (strlen (desc), 10),
                             "ellipsize",       PANGO_ELLIPSIZE_END,
                             NULL);