Implement FileListWidget.FILES_AND_DIRECTORIES also for FileWidget

[tischi]

It would be great to implement FileListWidget.FILES_AND_DIRECTORIES also for FileWidget.

See forum post for details: https://forum.image.sc/t/scijava-ui-open-both-file-and-directory/97389/4

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/scijava-ui-open-both-file-and-directory/97389/5

[tischi]

Hi @imagejan, I had a brief look and this should be doable...do you want me to create a PR (I may have some time in a train on Sunday...)?

[imagejan]

@tischi yes, please do if you find the time. I'll be happy to review and test!

[tischi]

@imagejan here we go: #84