This is an example where Cage/claudeQuads=false fails.

Load the project in the current version of ImageEditor
with the provided config.ini.

ImageEditor --config config.ini -f pm3508o.png --project pm3508o.json

Look at layer-10 (top left corner) in cage mode. Look at tiles
(6,3) and (7,4). Zoom in and you'll see 2 horizontal black lines.
See attached image 3508_layer10.png.

With Cage/claudeQuads=true, the correct behaviour is observed.
This illustrates the need for the iterative correction to solve
the non-linear equation for mapping a point between the before
and after cage tiles. This mode should always be set to true in
the default config file in samples/misc/config.ini.