[gjs: 8/14] value: Support creating a GType from a GValue holding it

[Philip Chimento <pchimento src gnome org>]

commit a47a27b44eba8e17b5b48e82b10e651ba1d94e8d
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri Apr 9 06:18:50 2021 +0200

    value: Support creating a GType from a GValue holding it
    
    If a GValue holds a GType we should create a GType wrapper for it,
    currently we were failing this and functions returning GValue's holding
    GType's couldn't be handled correctly (as we were considering the value
    a pointer type).

 gi/value.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/gi/value.cpp b/gi/value.cpp
index bba2702a..75b99041 100644
--- a/gi/value.cpp
+++ b/gi/value.cpp
@@ -992,6 +992,20 @@ gjs_value_from_g_value_internal(JSContext             *context,
         g_base_info_unref((GIBaseInfo*)arg_info);
         g_base_info_unref((GIBaseInfo*)signal_info);
         return res;
+    } else if (gtype == G_TYPE_GTYPE) {
+        GType gvalue_gtype = g_value_get_gtype(gvalue);
+
+        if (gvalue_gtype == 0) {
+            value_p.setNull();
+            return true;
+        }
+
+        JS::RootedObject obj(
+            context, gjs_gtype_create_gtype_wrapper(context, gvalue_gtype));
+        if (!obj)
+            return false;
+
+        value_p.setObject(*obj);
     } else if (g_type_is_a(gtype, G_TYPE_POINTER)) {
         gpointer pointer;