enable interactive tools that can operate on "Current canvas" extent to manage layers owned by QGIS

[Andreas Janz]

By coincidence, the tools work fine with layers owned by QGIS as long as the extent used is “Whole raster”.

For “Current canvas” they fail, because we just look at EnMAP-Box map view canvases.

One tool is the Raster Layer Styling panel:

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Other tools are:

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[Benjamin Jakimow]

You can use the maplayer.project() information
To see if the layer instance is owned either by QGIS or the EnMAP-Box, you can use the maplayer.project():
maplayer.project() == QgsProject.instance() -> QGIS
maplayer.project() == EnMAPBox().project() -> EnMAP-Box

Be aware that the same layer can occur in both projects. For example tests like
if maplayer in list(QgsProject.instance().mapLayers().values())

do not guarantee ownership of the underlying QgsMapLayerStore.