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diff --git a/src/remmina_scrolled_viewport.h b/src/remmina_scrolled_viewport.h
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+++ b/src/remmina_scrolled_viewport.h
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+/*
+ * Remmina - The GTK+ Remote Desktop Client
+ * Copyright (C) 2009 - Vic Lee
+ * Copyright (C) 2017-2023 Antenore Gatta, Giovanni Panozzo
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ *  In addition, as a special exception, the copyright holders give
+ *  permission to link the code of portions of this program with the
+ *  OpenSSL library under certain conditions as described in each
+ *  individual source file, and distribute linked combinations
+ *  including the two.
+ *  You must obey the GNU General Public License in all respects
+ *  for all of the code used other than OpenSSL. *  If you modify
+ *  file(s) with this exception, you may extend this exception to your
+ *  version of the file(s), but you are not obligated to do so. *  If you
+ *  do not wish to do so, delete this exception statement from your
+ *  version. *  If you delete this exception statement from all source
+ *  files in the program, then also delete it here.
+ *
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+#define REMMINA_TYPE_SCROLLED_VIEWPORT \
+	(remmina_scrolled_viewport_get_type())
+#define REMMINA_SCROLLED_VIEWPORT(obj) \
+	(G_TYPE_CHECK_INSTANCE_CAST((obj), REMMINA_TYPE_SCROLLED_VIEWPORT, RemminaScrolledViewport))
+#define REMMINA_SCROLLED_VIEWPORT_CLASS(klass) \
+	(G_TYPE_CHECK_CLASS_CAST((klass), REMMINA_TYPE_SCROLLED_VIEWPORT, RemminaScrolledViewportClass))
+#define REMMINA_IS_SCROLLED_VIEWPORT(obj) \
+	(G_TYPE_CHECK_INSTANCE_TYPE((obj), REMMINA_TYPE_SCROLLED_VIEWPORT))
+#define REMMINA_IS_SCROLLED_VIEWPORT_CLASS(klass) \
+	(G_TYPE_CHECK_CLASS_TYPE((klass), REMMINA_TYPE_SCROLLED_VIEWPORT))
+#define REMMINA_SCROLLED_VIEWPORT_GET_CLASS(obj) \
+	(G_TYPE_INSTANCE_GET_CLASS((obj), REMMINA_TYPE_SCROLLED_VIEWPORT, RemminaScrolledViewportClass))
+
+typedef struct _RemminaScrolledViewport {
+	GtkEventBox	event_box;
+
+	/* Motion activates in Viewport Fullscreen mode */
+	guint		viewport_motion_handler;
+} RemminaScrolledViewport;
+
+typedef struct _RemminaScrolledViewportClass {
+	GtkEventBoxClass parent_class;
+} RemminaScrolledViewportClass;
+
+GType remmina_scrolled_viewport_get_type(void)
+G_GNUC_CONST;
+
+GtkWidget *remmina_scrolled_viewport_new(void);
+void remmina_scrolled_viewport_remove_motion(RemminaScrolledViewport *gsv);
+
+#define SCROLL_BORDER_SIZE 1
+
+G_END_DECLS