https://bugs.kde.org/show_bug.cgi?id=415788

--- Comment #8 from Ahab Greybeard <ahab.greybe...@hotmail.co.uk> ---
Created attachment 125012
  --> https://bugs.kde.org/attachment.cgi?id=125012&action=edit
Shows centre-pivot of transform moved off-canvas

I have an additional observation as shown in the attached screenshots:

If you make a small vertical upwards movement of the (rotated) square, then the
Transform mask shows the centre-pivot point has moved up and to the right as
shown in centre-pivot-offset.png.
A further move to the bottom of the canvas sends the centre-pivot point lower
and to the left, off-canvas as shown in centre-pivot-off-canvas.png.

There are similar movements of the vanishing points of a perspective transform
if that is used. This causes distortion of the intended transform effects.

A transform mask doesn't actually have a 'mask', unlike a filter mask and
(obviously) a transparency mask. A transform mask is applied to the entire
layer. When you move a paint layer then any associated  filter mask or
transparency mask moves with it.

To maintain the rotation transform properly on the object then the centre-pivot
should be moved but this seems to be going wrong.

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