[QGIS-Developer] Removing QgsProject.instance() from Python bindings?

[Nyall Dawson]

>>
>> Just wondering... before 3.0 launch, should we remove
>> QgsProject.instance() from the Python bindings, in favour of something
>> like iface.activeProject()?
>>
>> Sometime in the future (4.0?) we'll end up killing
>> QgsProject.instance(), but in the meantime is it a good move to push
>> people away from relying on this method?
>>
>> I'd say yes, given that the 2.x -> 3.0 api break is so huge anyway and
>> will generally result in substantial plugin rewriting (vs just
>> modifying a few methods), maybe we're better off to get PyQGIS
>> developers to deal with this now and factor it into their new
>> designs?*
>>
>> Nyall
>>
>> * based on the belief that 3.x -> 4.0 will be a gentler transition!!
>> _______________________________________________

Ok, based on the results of https://github.com/qgis/QGIS/pull/5974 ,
we'll have to defer this until 4.0 when (hopefully) we have much fewer
QgsProject::instance() calls in core/gui/providers.

Nyall