[Virtual Raster Builder] dropping source band gives an error

[Andreas Rabe]

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AssertionError

Traceback (most recent call last):
  File "C:\Users/Andreas/AppData/Roaming/QGIS/QGIS3\profiles\EnMAP-Box Develop/python/plugins\vrtbuilderplugin\vrtbuilder\widgets.py", line 182, in onBandInserted
    assert i == index
AssertionError

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