This controls how close labels are permitted to the edges of the map
item. The labeling engine will then try other candidate positions
in order to avoid placing labels within this margin.
Instead, only rasterize that one item and pre-apply it's opacity
to the rasterized version. This keeps all the rest of the layout
content as vectors/text.
Sometimes, calling some layout methods, results in sip being inable
to downcast the items to their correct type, resulting only
in a QgsLayoutItem object.
This works around the problem, albeit in an incredibly hacky way.
Checks whether a function declaration has parameters that are
top level const.
const values in declarations do not affect the signature of a
function, so they should not be put there.
