[16.0][ADD] web_widget_many2many_binary_preview

[hbrunn]

This module allows developers to enable a preview on fields displayed with widget many2many_binary.

Easiest way to test this is to edit the view of mail templates and add the attribute show_preview="True" which I just did on runboat

[thomaspaulb]

I've tested and noticed that even though you limit width and height to very low numbers (I tried 50x50), and I make the container width very high (by embedding the field in a , or artificially by adding width: 100% to the field div element, I can't get the thumbnails to float: left with eachother nicely. The block with the image and its nearby caption just stretches, and the next one always comes below:

[hbrunn]

that's what the binary attachment widget does, not sure if we should change this here. Would adding display: flex to the .o_attachments div solve the issue for your use case?