The following three bugs are closed, but there still seems to be a
related? new? bug with nohalo scaling (and probably lohalo, but not with
cubic or linear):
Bug 634901 - Resizing an image with alphachannel creates 1 pixel border
down and right
Bug 698601 - scaling up without alpha adds several-pixel gradient border
Bug 734378 - Image manipulation (scale,rotate) may cause vertical image
Scaling up or down using nohalo produces a partially transparent border
around the layer if the layer has an alpha channel. This is a
long-standing issue that still obtains (at least scaling down has
produced the edge artifact for a long time, bug 698601 describes the
opposite situtation for scaling up).
I only just discovered that removing the alpha channel at least
sometimes allows to scale a layer without creating the edge artifacts.
So I'm not sure if removing the alpha channel always allows to scale
without creating edge artifacts.
This bug was confirmed using babl/GEGL/GIMP updated today.
Should I file a new bug report? or maybe instead open one of the old bug
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