Card SnapShot from Negative Rect?

[-hh]

Yet another option could be:

[1] Shift each control down and right, so that the negative coords become
non-negative
and enlarge also the stack size so that the rectangle fits into the stack
window (and hide img X)
[2] Take your snapshot from the 'shifted' rect to img X.
I use 'export snapshot from rect <rect> of window windowID here and resize
the image if necesary.
[3] Invert the action from step 1 (and show img X)

This works pretty fast.
Sadly we cannot lock screen for that, so there is some 'flickering' and it
is, contrary to export snapshot from a group, restricted to current
screensize.




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