Make all the normal widgets uneditable and non-focusing

We always keep the focus on the dive list, so that the random gtk focus
handling doesn't suddenly randomly make us edit the combo boxes when the
cursor up/down keys start changing them instead of the dive list.

This means that dive location, notes and buddy/divemaster aren't
editable at all any more, but I'll fix that by making a separate dive
edit popup window.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

equipment.c

@@ -853,6 +853,7 @@ static GtkWidget *cylinder_list_create(void)
 		);
 	cylinder_list.model = model;
 	tree_view = gtk_tree_view_new_with_model(GTK_TREE_MODEL(model));
+	gtk_widget_set_can_focus(tree_view, FALSE);
 	g_signal_connect(tree_view, "row-activated", G_CALLBACK(row_activated_cb), model);
 
 	selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(tree_view));