Attempts to set the input band for the renderer.
Returns TRUE if the band was successfully set, or FALSE if the
band could not be set.
This was implemented in various raster renderer subclasses,
but it was necessary to down cast and then call the individual
methods (which don't have consistent names!).
Instead, add a top level virtual method so that it's easy to
change the input band for the renderers.
to QgsRasterTransparency.TransparentSingleValuePixel. Allows (via
API only) control over whether the extremities of the range
should be included in the transparency.
Also add equality operator, repr to these classes, and additional
tests
The original workaround was only supposed to apply to QList/
QVector of QVariantMaps. By replacing them all in sip we
break mapping of signals defined in c++ which are emitted
by Python code.
Fixes exceptions after running processing algorithms in Qt6
builds.
