to show in numeric/distance widgets
E.g. to only show 2 decimal places:
# only show two decimal places in parameter's widgets, not 6:
param.setMetadata( {'widget_wrapper':
{ 'decimals': 2 }
})
their underlying algorithm's provider
E.g. for model outputs generated by a saga algorithm, only
sdat and shp files are valid outputs. So only give users choices
of these instead of all formats.
Also fixes temporary file names generated as part of model
execution may use formats which are not compatible with the
algorithm's provider.
Fixes#18908
