[gtksourceview] utils: add extra font-variant features from Pango 1.50

[Christian Hergert <chergert src gnome org>]

commit c36ec449542f6dbcab2fac2be5c3f1ae182cbff3
Author: Christian Hergert <chergert redhat com>
Date:   Fri Nov 12 10:58:46 2021 -0800

    utils: add extra font-variant features from Pango 1.50

 gtksourceview/gtksourceutils.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
---
diff --git a/gtksourceview/gtksourceutils.c b/gtksourceview/gtksourceutils.c
index f79d9d09..e3ee8682 100644
--- a/gtksourceview/gtksourceutils.c
+++ b/gtksourceview/gtksourceutils.c
@@ -391,6 +391,28 @@ _gtk_source_utils_pango_font_description_to_css (const PangoFontDescription *fon
                                ADD_KEYVAL (FONT_VARIANT, "small-caps");
                                break;
 
+#if PANGO_VERSION_CHECK(1, 49, 3)
+                       case PANGO_VARIANT_ALL_SMALL_CAPS:
+                               ADD_KEYVAL (FONT_VARIANT, "all-small-caps");
+                               break;
+
+                       case PANGO_VARIANT_PETITE_CAPS:
+                               ADD_KEYVAL (FONT_VARIANT, "petite-caps");
+                               break;
+
+                       case PANGO_VARIANT_ALL_PETITE_CAPS:
+                               ADD_KEYVAL (FONT_VARIANT, "all-petite-caps");
+                               break;
+
+                       case PANGO_VARIANT_UNICASE:
+                               ADD_KEYVAL (FONT_VARIANT, "unicase");
+                               break;
+
+                       case PANGO_VARIANT_TITLE_CAPS:
+                               ADD_KEYVAL (FONT_VARIANT, "titling-caps");
+                               break;
+#endif
+
                        default:
                                break;
                }