Harmonize file filter logic for File inputs #58
Description
We currently have inconsistent logic when setting up a file filter for File and File[] inputs.
The extensions style is only supported for File[] inputs, not for File, see:
Actually, the file filter seems to work for drag-and-drop (in FileHandler):
... but not for the Browse button.
Related scijava-common issue: scijava/scijava-common#197