Add previews

[mjthoraval]

It takes quite some time to test different options, as you need to close and restart Zotero every time to see the result.
It would be very useful to have a Preview tool to show what the results will look like in each column. This would make the tunning of parameters much faster.

A similar functionality is used for example in the Settings -> General -> File Renaming -> Customize Filename Format... -> Preview.

[github-young]

Thanks to @jstzwj , v4.0.0 now supports previews. Please close this issue if it is solved.

[mjthoraval]

Thank you very much!
Closed.