id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
13030	Allow the creation of two map views	michael2402	team	"The main goal of this ticket is to allow the creation and use of two map views. It is a central place to collect things preventing us from using multiple map views.

So far, those are the main problems for displaying the same layers twice:
- Main.map.mapView.repaint() or Main.map.repaint() calls. They can be traced using the --trace option. The stach trace triggering such a repaint will be dumped. Layers should simply invalidate their layer. Use #12654
   - undo does not trigger a layer invalidated
- `Layer.isChanged()` cannot be used with multiple map views. Map view needs to track changes by itself using the invalidation events
- AbstractTileSourceLayer needs to be changed to use one TileSet per MapView.

Displaying different layers:
- The layer list is already prepared to work with multiple layer managers.
- Many layers assume they are only added/removed once to a layer manager (AbstractTileSourceLayer, ValidatorLayer, MarkerLayer, ...). #12872 might solve this for implicitly added layers.

Editing in the second view will be much harder, because:
- MapModes assume there is only one map view


This works:
- Creating a second MapView
- Moving and zooming the map
- Display a data layer
- Display selection

[[Image(mapview-window.png, 800px)]]"	enhancement	new	normal		Core			gsoc-core	Don-vip bastiK stoecker