[gimp/wip/nielsdg/fix-gir-errors] Fix missing includes

[Niels De Graef <nielsdg src gnome org>]

commit 25e535b5e0d6ad988827589d77fd4ac54f206db9
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Thu May 21 16:02:55 2020 +0200

    Fix missing includes
    
    We're exposing symbols in our header files like `GType`, `GFile` and
    others, without actually including the proper headers. This also gives
    errors in the GIR scanner (who can't resolve those symbols).

 libgimp/gimp.h             | 1 +
 libgimp/gimpui.h           | 2 ++
 libgimpmodule/gimpmodule.h | 1 +
 3 files changed, 4 insertions(+)
---
diff --git a/libgimp/gimp.h b/libgimp/gimp.h
index 1167a3e085..0578715da1 100644
--- a/libgimp/gimp.h
+++ b/libgimp/gimp.h
@@ -22,6 +22,7 @@
 #define __GIMP_H__
 
 #include <cairo.h>
+#include <glib-object.h>
 #include <gegl.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 
diff --git a/libgimp/gimpui.h b/libgimp/gimpui.h
index 08e591b1b8..2d3db085e4 100644
--- a/libgimp/gimpui.h
+++ b/libgimp/gimpui.h
@@ -19,7 +19,9 @@
 #ifndef __GIMP_UI_H__
 #define __GIMP_UI_H__
 
+#include <gio/gio.h>
 #include <gtk/gtk.h>
+#include <libgimp/gimp.h>
 
 #include <libgimpwidgets/gimpwidgets.h>
 
diff --git a/libgimpmodule/gimpmodule.h b/libgimpmodule/gimpmodule.h
index 783b07dedf..d10a7a4a7c 100644
--- a/libgimpmodule/gimpmodule.h
+++ b/libgimpmodule/gimpmodule.h
@@ -22,6 +22,7 @@
 #ifndef __GIMP_MODULE_H__
 #define __GIMP_MODULE_H__
 
+#include <gio/gio.h>
 #include <gmodule.h>
 
 #define __GIMP_MODULE_H_INSIDE__