Data Sources: Clearing removes Raster Layers but not Vector Layers

[Fabian Thiel]

Right-clicking on Raster Data --> Clear in the Data Sources panel will remove all rasters from the Data Sources tab AND from the Data Views (i.e. also Map View).

For Vector datasets, it will only remove them from the Data Sources panel, but they will remain in the Data Views.

[Benjamin Jakimow]

fixes Issue #169

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