Don't hardcode link colour in the details page

Hardcoding a foreground colour but not the corresponding background
colour (or viceversa) is braindamaged and leads to unreadable text
depending on the active theme.

Use the theme's link colour instead.

---
 gucharmap/gucharmap-charmap.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

Index: b/gucharmap/gucharmap-charmap.c
===================================================================
--- a/gucharmap/gucharmap-charmap.c
+++ b/gucharmap/gucharmap-charmap.c
@@ -547,12 +547,18 @@ insert_codepoint (GucharmapCharmap *char
                   GtkTextIter *iter,
                   gunichar uc)
 {
-  gchar *str;
+  GucharmapCharmapPrivate *priv = charmap->priv;
   GtkTextTag *tag;
+  GtkStyleContext *stylectx;
+  gchar *str;
   char buf[7];
   GUnicodeType t;
   gboolean is_graph, is_Mn;
   char nbsp[3] = "\302\240"; /* U+00A0 NO-BREAK SPACE */
+  GdkRGBA link_colour = {0, 0, 1, 1}; /* "blue" */
+
+  stylectx = gtk_widget_get_style_context (GTK_WIDGET (priv->details_view));
+  gtk_style_context_get_color (stylectx, GTK_STATE_FLAG_LINK, &link_colour);
 
   t = g_unichar_type (uc);
   is_Mn = t == G_UNICODE_NON_SPACING_MARK /* Mn */;
@@ -569,9 +575,10 @@ insert_codepoint (GucharmapCharmap *char
                          gucharmap_get_unicode_name (uc));
 
   tag = gtk_text_buffer_create_tag (buffer, NULL,
-                                    "foreground", "blue",
                                     "underline", PANGO_UNDERLINE_SINGLE,
                                     NULL);
+  g_object_set (tag, "foreground-rgba", &link_colour, NULL);
+
   /* add one so that zero is the "nothing" value, since U+0000 is a character */
   g_object_set_data (G_OBJECT (tag), "link-character", GUINT_TO_POINTER (uc + 1));