Minor UI issue in recent Firefox (starting at about Firefox 115)

[Casey Duckering]

This is a bug in Firefox, not Quirk but you may want to track the issue here. The horizontal qubit and measurement wires in the circuit diagram display are rendered as slight zig-zag lines instead of continuous, perfectly horizontal lines.

See https://bugzilla.mozilla.org/show_bug.cgi?id=1847681 for more details. At minimum this affects Firefox versions 115 through 116 (and 118 nightly) but it does not affect 109 (or earlier).

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Quick-and-dirty fix that corrects the visual issue but breaks all other browsers (and the sampling gate icons):
src/draw/Painter.js:451

-         this.ctx.moveTo(x1, y1);
+         this.ctx.moveTo(x1, y1+0.5);

[Craig Gidney]

Thanks for reporting this to Mozilla. I will sit back and watch.