Rotate 90° without cropping

[will-moore]

See https://forum.image.sc/t/couple-of-suggestions-about-omero-figure/72675

"In the preview tab, for rectangle images, rotating the image crops a part of it because of the fix canvas. Therefore, it is not possible to flip the image by 90° and having it entirely displayed. I think it could be great to have an option to flip the image by 90° and 180° (left and right)."

This feature exists on various photo apps, often with a single button that rotates the image by 90° each time it's clicked, with icons like:

OMERO.figure could do this by automatically setting the rotation value and updating the width/height at the same time.

[imagesc-bot]

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

https://forum.image.sc/t/couple-of-suggestions-about-omero-figure/72675/2

[imagesc-bot]

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

https://forum.image.sc/t/omero-figure-crop-uses-original-image-aspect-ratio-after-rotation/89444/2

[Rdornier]

There is a issue when rotating and cropping an image. The cropped image loose the rotation information of the parent image