This is a patch to the autozoom feature that allows changing the autozoom_secs value through the use of the zoom in and zoom out commands. This allows the amount seen for any given speed to be dynamically changed from the GUI.
The patch affects only two functions: navit_zoom_in and navit_zoom_out. Now, when either of these is entered, a check is done to see if autozooming is active. If it is, this_->autozoom_secs is adjusted, otherwise the normal scaling takes place.