[Github-comments] [geany/geany] Notebook tabs mouse scroll with gtk3 (#2455)

[luigifab]

This is a duplicate of #1778 #1815 #1848, but here is a solution.
I see that in mate-appearance-properties the mouse scroll works very well like this:

	#include <gdk/gdk.h>
	#if GTK_CHECK_VERSION (3,0,0)
	gtk_widget_add_events (GTK_WIDGET (notebook1), GDK_SCROLL_MASK);
	g_signal_connect (GTK_WIDGET (notebook1), "scroll-event",
					G_CALLBACK (capplet_dialog_page_scroll_event_cb),
					GTK_WINDOW (window));
	#endif

[source](https://github.com/mate-desktop/mate-control-center/blob/master/capplets/appearance/appearance-main.c#L208) + [capplet_dialog_page_scroll_event_cb function](https://github.com/mate-desktop/mate-control-center/blob/master/capplets/common/capplet-util.c#L173)

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