I need to combine count results on queries on multiple layers.
(I have a layer for each geometry type, however with same attributes. I need a chart which should not differentiate the geometry type!)
The custom widget comes with just a configurable data source (and title) hard-coded in the configuration pop-up.
How can I add a second and a third data source?
Yes, I have figured out, I have even fix the bug from getDataSourceProxies, but I still cannot obtaing notifications from other data sources.
Also, I cannot save settings without binding them to the data source configured in configuration...