l_layer_lower: Switch the layer place with its sibling to the right
Description
Change the layers position within its parent layer group by
increasing the index of the layer by one if possible. This means
that the raised layer will be rendered before (or on below) of its sibling
layer to the right.
Usage
l_layer_lower(widget, layer)
Value
0 if success otherwise the function throws an error
Arguments
widget
widget path or layer object of class 'l_layer'
layer
layer id. If the widget argument is of class 'l_layer'
then the layer argument is not used