debugui: replace a hard coded value with a style member

Author: hajimehoshi

layout.go

@@ -24,7 +24,7 @@ func (l *layout) widthInPixels(style *style) int {
 }
 
 func (l *layout) heightInPixels(style *style) int {
-	return l.sizeInPixels(l.heights, l.itemIndex/len(l.widths), 18, l.body.Dy(), style)
+	return l.sizeInPixels(l.heights, l.itemIndex/len(l.widths), style.defaultHeight, l.body.Dy(), style)
 }
 
 func (l *layout) sizeInPixels(sizes []int, index int, defaultSize int, entireSize int, style *style) int {

style.go

@@ -9,6 +9,7 @@ import (
 
 type style struct {
 	defaultWidth  int
+	defaultHeight int
 	padding       int
 	spacing       int
 	indent        int
@@ -39,6 +40,7 @@ const (
 
 var defaultStyle style = style{
 	defaultWidth:  60,
+	defaultHeight: 18,
 	padding:       5,
 	spacing:       4,
 	indent:        lineHeight(),