From ebc4f9afab940e99a350ec99538194c2c64dc67b Mon Sep 17 00:00:00 2001
From: Jehan <jehan@girinstud.io>
Date: Sun, 7 Jul 2024 22:17:44 +0200
Subject: [PATCH] app, libgimp: initialize GimpGroupLayer.

If the type is not registered, g_type_from_name() is not able to find
the GType from the type name.

Fixes:

> gimp_gp_param_to_value: type name GimpGroupLayer is not registered

Also add a bit more type handling code.
---
 app/plug-in/gimpgpparams.c  |  3 +++
 libgimp/gimp.c              |  1 +
 libgimp/gimpgpparams-body.c | 11 +++++++++--
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/app/plug-in/gimpgpparams.c b/app/plug-in/gimpgpparams.c
index 90aa21721f..6e85616ec5 100644
--- a/app/plug-in/gimpgpparams.c
+++ b/app/plug-in/gimpgpparams.c
@@ -34,13 +34,16 @@
 #include "core/gimpbrush.h"
 #include "core/gimpdisplay.h"
 #include "core/gimpgradient.h"
+#include "core/gimpgrouplayer.h"
 #include "core/gimpimage.h"
 #include "core/gimplayer.h"
 #include "core/gimplayermask.h"
 #include "core/gimppalette.h"
 #include "core/gimppattern.h"
 #include "core/gimpselection.h"
+
 #include "text/gimpfont.h"
+#include "text/gimptextlayer.h"
 
 #include "core/gimpparamspecs.h"
 
diff --git a/libgimp/gimp.c b/libgimp/gimp.c
index 5d02804262..9b1b10e53a 100644
--- a/libgimp/gimp.c
+++ b/libgimp/gimp.c
@@ -434,6 +434,7 @@ gimp_main (GType  plug_in_type,
       GIMP_TYPE_DRAWABLE,      GIMP_TYPE_PARAM_DRAWABLE,
       GIMP_TYPE_LAYER,         GIMP_TYPE_PARAM_LAYER,
       GIMP_TYPE_TEXT_LAYER,    GIMP_TYPE_PARAM_TEXT_LAYER,
+      GIMP_TYPE_GROUP_LAYER,   GIMP_TYPE_PARAM_GROUP_LAYER,
       GIMP_TYPE_CHANNEL,       GIMP_TYPE_PARAM_CHANNEL,
       GIMP_TYPE_LAYER_MASK,    GIMP_TYPE_PARAM_LAYER_MASK,
       GIMP_TYPE_SELECTION,     GIMP_TYPE_PARAM_SELECTION,
diff --git a/libgimp/gimpgpparams-body.c b/libgimp/gimpgpparams-body.c
index 025e82fba0..23d6042b63 100644
--- a/libgimp/gimpgpparams-body.c
+++ b/libgimp/gimpgpparams-body.c
@@ -522,11 +522,18 @@ _gimp_param_spec_to_gp_param_def (GParamSpec *pspec,
         {
           type_name = "GimpParamDrawable";
         }
-      else if (g_type_is_a (value_type, GIMP_TYPE_LAYER))
+      else if (value_type == GIMP_TYPE_LAYER)
         {
-          /* g_type_is_a() because the core has layer subclasses */
           type_name = "GimpParamLayer";
         }
+      else if (value_type == GIMP_TYPE_TEXT_LAYER)
+        {
+          type_name = "GimpParamTextLayer";
+        }
+      else if (value_type == GIMP_TYPE_GROUP_LAYER)
+        {
+          type_name = "GimpParamGroupLayer";
+        }
       else if (value_type == GIMP_TYPE_CHANNEL)
         {
           type_name = "GimpParamChannel";