Hi Garry,
Here's my "Performance" panel.
About the exact sequence, well it's quite simple :
- I'm in the middle of drawing something, and I need to change the angle of some part of my drawing
- I make sure the active layer is the one I need to rotate
- I click on the move tool, the blue frame appears around the element(s) of the layer
- I get my cursor near a corner of the frame so the rotate icon appears, I rotate to the angle I need (may it be 10 ° or a lot more..), I confirm.
- From now on, what already was on the rotated layer get very "jagged" edges (sorry I'm not sure about the meaning in English but I think that's the appropriate word), and whatever I would add on it get this problem as well. I mean even if I draw a straight, horizontal or vertical line (see my example above), it gets these weird jagged edges. If I merge another layer with this one, everything's altered. If I make a rectangular selection and start colouring inside it, until I fill it, the same thing will appear : jagged edges right outside the selection edges... I really don't get it.
Thanks for trying to help.