FormItem takes *ui.Context first (PRD 6.1); drop dead internal.Rule

internal/display.go

@@ -6,12 +6,6 @@ import (
 	"github.com/egoist/mygo/ui"
 )
 
-// Rule draws a pixel-aligned 1 DIP horizontal line at y.
-func Rule(p *ui.Painter, x0, x1, y float32, c ui.Color) {
-	yy := ruleY(p, y)
-	p.Line(x0, yy, x1, yy, 1, c)
-}
-
 // ruleY moves y to where a 1 DIP line fills whole device pixels.
 func ruleY(p *ui.Painter, y float32) float32 {
 	s := float64(p.Scale())