background() clear may be incorrect

[belm0]

Depending on browser zoom level, the fillRect() for clearing the background may either be too large or too small (only the latter is noticeable, when using zoom less than 100%).

Due to devicePixelRatio scaling, using the canvas size directly is not correct. The code below should use self.width / self.height.

pura/src/pura/_web_view.py

Line 363 in d5351f1

f"ctx.fillRect(0, 0, canvas.width, canvas.height);"

pura/src/pura/_web_view.py

Line 268 in d5351f1

f"ctx.fillRect(0, 0, canvas.width, canvas.height);"