Allow showing file list widget instead of file chooser

[imagejan]

When using a single File[] parameter like:

#@ File[] (style="extensions:tif/tiff/ims") files

.. we always show a file chooser dialog using chooseFiles.
Only when a second unrelated parameter is added, a file list widget is shown in a generated input dialog:

#@ File[] (style="extensions:tif/tiff/ims") files
#@ String (required=false) ignoreThis

There should be a possiblity to get an input dialog with the file list widget, without the need to add secondary parameters.

(I thought I had opened a ticket about this long ago, but I couldn't find it, so here it is.)

[imagesc-bot]

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

https://forum.image.sc/t/drag-and-drop-file-list/65646/3

[ctrueden]

Yeah, something like autofill=false, but for the FilePreprocessor and FileListPreprocessor to know they shouldn't do this shortcut of popping the file chooser dialog directly. I also remember you mentioning this before, @imagejan, but don't have time to dig for existing issues right now, sorry.

[imagejan]

I found the previous mentions here:

scijava/batch-processor#20
scijava/scijava-common#420

So now we have an open issue in each of the relevant repositories 🤷

Edit:
And there's scijava/scijava-common#423 already 🚀