Incorrect shape unpacking in edit_new_image_parameters

[cdebonnel]

Description

In the edit_new_image_parameters method of PluginBase, the shape tuple is unpacked as follows:

if shape is not None:
    newparam.width, newparam.height = shape

This code assumes that shape is a tuple of (width, height). However, DataLab uses a different convention for image shapes, where the tuple should be interpreted as (height, width). As a result, the current unpacking will lead to images with swapped dimensions for non-square images. This issue has not been noticed so far because the method is only used once in the code base for a square image.

Expected behavior

The method should unpack the shape tuple according to DataLab's convention, ensuring that images are created with the correct dimensions.

Suggested fix

if shape is not None:
    newparam.height , newparam.width = shape