https://bugs.kde.org/show_bug.cgi?id=390418

            Bug ID: 390418
           Summary: Saving layers with python script gives incorrect
                    results
           Product: krita
           Version: 4.0.0-beta.1
          Platform: unspecified
                OS: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Scripting
          Assignee: krita-bugs-n...@kde.org
          Reporter: h...@heff.se
  Target Milestone: ---

When using the Node::save() function of libkis in python, the data that is
saved does not take into account the position of the layer, and as such saves
the wrong data.

The width and height of the layer is respected, but the data seems to always be
pulled from the top left.

To reproduce: Enable the exportslayers python plugin and create a layer that
does not fill the canvas fully and has no content in the top left corner, then
export.


Quick speculation:
I'm new to this codebase, and currently do not have a setup available to
properly debug, but peeking at the code I'm guessing that the intersection
calculation in KisPaintDevice::makeCloneFrom is given invalid bounds data, and
that's where I'd start looking for a trace. 
(https://phabricator.kde.org/source/krita/browse/master/libs/image/kis_paint_device.cc)

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