@ljwrites Hey, it's not a strange trick but a common feature for drawer/painter artist:
Only the viewport is mirrored (the pixels of your files are not affected) this is a well known helper when an artist needs to notice deformation/bad proportion in anatomy. While drawing, the brain can deform visually a wrong anatomy to look good for the artist. By, pressing M, it flips the picture and the brain doesn't recognise it and stop auto-fixing it. Then the artist can notice mistakes. Very useful.
@davidrevoy Ah I see, another way Krita is a painter's program rather than an image manipulation program! I've only ever used the latter before so the paradigm is somewhat different.
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