Allows setting symbols other map item sizes to Map Units in Meters. This allows setting the size always in meters, regardless of what the underlying map units are (e.g. they can be it geographic degrees). The size in meters is calculated based on the current project ellipsoid setting and a projection of the distances in meters at the center of the current map extent.
The dialogs are parented to the main window, which means sip
transfers the ownership to the main window - and they are
never deleted as a result. This results in various error
messages caused by the widgets hanging around forever
and listening out for various signals they are connected to.
parameters to an algorithm
QgsProcessingAlgorithm::addParameter() has a new createOuput
argument (true by default).
If the createOutput argument is true, then a corresponding
output definition will also be created (and added to the
algorithm) where appropriate. E.g. when adding a
QgsProcessingParameterVectorDestination and createOutput is
true, then a QgsProcessingOutputVectorLayer output will be
created and added to the algorithm. There is no need to call
addOutput() to manually add a corresponding output for this
vector. If createOutput is false then this automatic output
creation will not occur.
This should simplify declaration of outputs for algorithms
as it avoids the need to manually declare these corresponding
outputs.
Instead of relying on forward declared c++ classes from
gui in QgsLayoutItemRegistry, instead create a
QgsLayoutItemGuiRegistry which handles registration
of all the GUI specific behavior relating to layout items.
Remove all GUI related code from QgsLayoutItemRegistry.
This creates a cleaner split between core/gui code, and
given that there'll be a lot of gui specific behavior
which needs to be handled by a registry it makes sense
to keep this isolated in gui.
It also plays nicer with the sip bindings, which can't
handle forward declared gui classes in core.
