[gtk+] emoji: Skip overly wide fallback rendering

[Matthias Clasen <matthiasc src gnome org>]

commit 675a4111e9f48b1f2290eafdc0d9598fbe48e199
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Dec 17 22:09:08 2017 -0500

    emoji: Skip overly wide fallback rendering
    
    Some emoji fonts (such as Emoji One), render Emoji sequences
    such as some of the family variations using multiple individual
    glyphs. This rendering is too wide and breaks our grid layout.
    Therefore, we will just skip any sequence whose rendering is
    more than twice as wide as a simple smiley.

 gtk/gtkemojichooser.c |   20 +++++++++++++++++++-
 1 files changed, 19 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkemojichooser.c b/gtk/gtkemojichooser.c
index 596c92e..9f1cb41 100644
--- a/gtk/gtkemojichooser.c
+++ b/gtk/gtkemojichooser.c
@@ -343,6 +343,9 @@ add_emoji (GtkWidget    *box,
   char text[64];
   char *p = text;
   int i;
+  PangoLayout *layout;
+  PangoRectangle rect;
+  int width;
 
   codes = g_variant_get_child_value (item, 0);
   for (i = 0; i < g_variant_n_children (codes); i++)
@@ -358,12 +361,27 @@ add_emoji (GtkWidget    *box,
   g_variant_unref (codes);
   p[0] = 0;
 
-  label = gtk_label_new (text);
+  label = gtk_label_new ("🙂");
   attrs = pango_attr_list_new ();
   pango_attr_list_insert (attrs, pango_attr_scale_new (PANGO_SCALE_X_LARGE));
   gtk_label_set_attributes (GTK_LABEL (label), attrs);
   pango_attr_list_unref (attrs);
 
+  layout = gtk_label_get_layout (GTK_LABEL (label));
+  pango_layout_get_extents (layout, &rect, NULL);
+  width = rect.width;
+
+  gtk_label_set_text (GTK_LABEL (label), text);
+  layout = gtk_label_get_layout (GTK_LABEL (label));
+  pango_layout_get_extents (layout, &rect, NULL);
+
+  /* Check for fallback rendering that generates too wide items */
+  if (rect.width >= 2 * width)
+    {
+      gtk_widget_destroy (label);
+      return;
+    }
+
   child = gtk_flow_box_child_new ();
   gtk_style_context_add_class (gtk_widget_get_style_context (child), "emoji");
   g_object_set_data_full (G_OBJECT (child), "emoji-data",