after creating a scratch layer source, and adding it to a map view, the source is shown twice

[Andreas Rabe]

Create scatch layer source:

After adding it to a map view, it is shown twice in the sources panel:

‌

[Benjamin Jakimow]

added project to mimedata.py extractMapLayer to extract memory layer instances added .project() to DataSourceManager and DockManager VectorDataSource keeps ref on mMemoryLayerReference resolves #1146

Signed-off-by: Benjamin Jakimow [e-mail] [e-mail]

→ <<cset c015e48d2201>>

[Benjamin Jakimow]

DataSourceManager updates datas source properties (resolves #1225)

added LayerItem to keep ref on memory layers, addresses #981, addresses #1227, addresses #1146

Signed-off-by: jakimowb [e-mail]

→ <<cset 5b79044fea26>>