Update line length before doing tests.

door/panel.go

@@ -54,6 +54,8 @@ func (p *Panel) Output() string {
 
 	for _, line := range p.Lines {
 		output += Goto(p.X, row)
+		line.LineLength(&line.Text)
+
 		var joined bool = false
 
 		if style > 0 {