@b4n commented on this pull request.

In debugger/src/tpage.c:

>  	}
 	g_list_free(modules);
 	gtk_combo_box_set_active(GTK_COMBO_BOX(debugger_cmb), 0);
 
 	/* arguments */
 	args_frame = gtk_frame_new(_("Command Line Arguments"));
+#if GTK_CHECK_VERSION(3, 0, 0)
+	hbox = gtk_scrolled_window_new(
+		gtk_scrollable_get_hadjustment(GTK_SCROLLABLE(args_textview)),
+		gtk_scrollable_get_vadjustment(GTK_SCROLLABLE(args_textview)));
+	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(hbox), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

Be it in GTK2 or GTK3, to actually be scrollable you need to put most widgets in a GtkScrolledWindow. The widgets "supporting scrolling" like GtkTreeView and GtkTextView know how to communicate with the ScrolledWindow. On GTK3 it's a proper interface; on GTK2 it was signals only.
Basically, what you usually would do is simply create a ScrolledWindow with passing NULL as the adjustments, and let GTK do it's thing when you add the child widget.

So, basically you could just use gtk_scrolled_window_new(NULL, NULL) followed by gtk_container_add() in bot GTK2 and GTK3.

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