ID 366616 - Overlapping images in the Image Manager cannot be detached

Problem summary
Overlapping images in the Image Manager cannot be detached 

Customer reported version
Mari 4.7v2

Customer reported platform
CentOS 7

Steps to reproduce
1) Open any project

2) Open the Image Manager and import multiple images

3) Drag one of the images over the other
 
4) Deselect the image

5) Attempt to drag the image back

Expected behaviour
The images should not be allowed to become overlapped, the position should shift to adjust or it should allow you to only 'pick' the top image.

Actual behaviour
Images can be overlapped and the UI does not adjust to allow you to rearrange the position of images. Overlapping images are permanently attached.

Workaround
Unknown.

Reproduced by support
This bug has been reproduced in:
Mari 4.7v3 - Windows 10 - CentOS 7.7
Mari 4.7v1 - Windows 10
Mari 4.6v1 - Windows 10
Mari 4.5v1 - Windows 10
Mari 4.2v1 - Windows 10
Mari 4.1v1 - Windows 10
Mari 4.0v1 - Windows 10 - CentOS 7.7

Unable to reproduce bug in:
Mari 3.4v4 - Windows 10 - CentOS 7.7

Earliest version tested
Mari 3.4v4 - This issue doesn't appear in this version and has regressed