"Band statistics" context menu button always disabled in DataSources panel

[Andreas Janz]

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[Benjamin Jakimow]

There is now a placeholder where you can connect it with your ImageStatisticsApp.

            a = m.addAction('Band statistics')
            a.setEnabled(False)
            # todo: AR call band stats dialog here
            # similar to:
            # a.triggered.connect(lambda: self.runImageStatistics(lyr))

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[Andreas Janz]

Note sure who has added the Band statistics button in the first place, but the ImageStatistics app is not usable for single bands only. It always calculates the stats for all bands. This functionallity is currently located in the DataViews panel:

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Let’s do this for now:

1. for v3.9: hide the Band statistics button
2. for 3.10: overhaul the ImageStatistics app to allow for single bands
3. enable the Band statistics button again

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[Andreas Janz]

Also, move the “Image Statistics” context menu button from DataSources to DataViews.

[Andreas Janz]

Removing version: 3.10 (automated comment)

[Andreas Janz]

relates to #951

[Andreas Janz]

New Band Statistics app is only operating on layers, not on sources. So we just delete the option from the context menu.