The Canvas tab's crosshair controls. Same precedence as the rest of the canvas block (see grid.ts): set overrides the theme, unset falls through.
Optional
Line colour. Unset falls back to theme.crosshair.
theme.crosshair
Line dash. Unset falls back to theme.crosshairStyle, then dashed.
theme.crosshairStyle
Line width in device px (1 = hairline). Unset falls back to the theme.
The Canvas tab's crosshair controls. Same precedence as the rest of the canvas block (see grid.ts): set overrides the theme, unset falls through.