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Line artifact when resizing layer

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When I select something then stretch it, a white line appears at the edge.  The video demonstrates this.  Why does this happen and how can this be fixed?  Photoshop does not do this to my knowledge.  

Edit:  when I stretch the selection slightly to the left to try and get rid of the white artifact, the artifact becomes darker instead and remains a visible line.

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I think you shifted the selection to the right which reveals the (white) canvas !


Affinity Photo   -  Beta

Windows 10 Home  1909 (build 18363.657) - 64 bit processor - AMD A4-5000 APU with Radeon HD Graphics  1.50GHz - RAM 8,00 GB
Calibrated Monitor (Datacolor Spyder5 Pro)


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When you stretch the pixels during the resize, the software has to create the new pixels from what it knows about the originals.
Unfortunately, it does this by ‘sharing’ the amount of colour that was in the original pixels amongst the new pixels.
Think of it like stretching a thin sheet of rubber, where the rubber becomes lighter the further you stretch it because the bits of the material containing the coloured pigment become further apart, or more diffuse (I'm not a materials scientist so this might not be exactly what happens, but the analogy works for me).
One basic method to counteract this is to duplicate the stretched layer a few times and merge the duplicates down into each other.
Another method is to use the Mesh Warp tool to stretch the layer instead.

Edited by GarryP
Added 'disclaimer'.
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