Plugin needs UI for resizing image beyond selecting attachment size

[goldenapples]

There needs to be a way to select image size beyond just choosing attachment size in the select field.

The WP core media experience has resize handles:

which may or may not be feasible to replicate in Shortcake preview wrap.

Maybe a text field in the attributes would work, although the experience isn't the greatest. This might need to wait until more field types, and hookable attribute update events, are available in Shortcake...

[goldenapples]

Another conversation where having a UI for this would be helpful: https://fusionnetwork.slack.com/archives/tech-money/p1432231101000019

[danielbachhuber]

Given we'll be removing image sizes entirely within the theme, we'll want to figure out how to best support this in Image Shortcake

[davisshaver]

Some thoughts on this after implementing https://github.com/fusioneng/fusion-theme/pull/3623/files:

• The Core experience can be abstracted as this: the resize corners adjust the image by a percentagewidth value that can exceed 100%, while maintaining alignment.
• The Core experience is benefitted from having non-block elements for images, which we still need to tackle in https://github.com/fusioneng/Shortcake/issues/9 and https://github.com/fusioneng/Shortcake/issues/376
• We also have https://github.com/fusioneng/image-shortcake/issues/49 to enable quick edit buttons. As noted in https://github.com/fusioneng/Shortcake/issues/376, the Medium model doesn't even include a tool for arbitrarily resizing the image – rather, the user can select from a few preset "fits" from an inline tool.

So it seems like we should make a choice between resolving the quick edit buttons first, or resolving the Shortcake block issue and adding drag corners to the view when the shortcode is an image (maybe then the drag issues also become a Shortcake issue so we can let other shortcodes use it more easily).