used outside of main canvas
E.g. we shouldn't show scale based visibility text format changes
or the editable toggle in models used for snapping dialog, project
properties, etc.
These properties are only associated with the main map canvas.
symbols to the left OR symbols to the right of legend text), and
alignment for group/subgroup/item text
Allows creation of right-to-left locale friendly legends. Additionally,
we default to this right-to-left style alignment when creating new
legends under a RTL based locale.
For the c++ api dox this expands to "\c nullptr" (the
\c directive indicates a code literal value), and for sipify/Python
it expands to ``None`` (`` is sphinx annotation for literal values)
Makes for nicer dox for both c++ and Python!
This can be used to restore initial layer status or to
apply styles and other layer properties if the data
source is changed.
The idea is that the user can fix bad layers at any time,
and by setting a new datasource she probably wants
to keep the original layer properties.
The issue was that during drag&drop, we first connect to layer's signal
for the second time, but then the disconnect() call on removal of the original
layer node would disconnect all connections (not just one). For that reason
now we only connect/disconnect when the layer is in the tree only once.
