some fixes for childlist

framework/h/renderables.go

@@ -37,7 +37,13 @@ func NewTextContent(content string) *TextContent {
 }
 
 func NewChildList(children ...Ren) *ChildList {
-	return &ChildList{
+	cl := &ChildList{
-		Children: children,
+		Children: Filter(children, func(item Ren) bool {
+			return item != nil
+		}),
 	}
+	if len(children) == 0 || children == nil {
+		cl.Children = make([]Ren, 0)
+	}
+	return cl
 }

framework/h/renderer.go

@@ -90,15 +90,17 @@ func (node *Element) Render(context *RenderContext) {
 	if shouldFlatten {
 		// first pass, flatten the children
 		flatChildren := make([]Ren, totalChildren)
-		for i, child := range node.children {
+		index := 0
+		for _, child := range node.children {
 			switch c := child.(type) {
 			case *ChildList:
 				for _, ren := range c.Children {
-					flatChildren[i] = ren
+					flatChildren[index] = ren
-					i++
+					index++
 				}
 			default:
-				flatChildren[i] = child
+				flatChildren[index] = child
+				index++
 			}
 		}
 

htmgo-site/pages/form.go

@@ -57,8 +57,9 @@ func SubmitButton() *h.Element {
 	)
 }
 
-func Spinner() *h.Element {
+func Spinner(children ...h.Ren) *h.Element {
 	return h.Div(
+		h.Children(children...),
 		h.Class("absolute left-1 spinner spinner-border animate-spin inline-block w-6 h-6 border-4 rounded-full border-slate-200 border-t-transparent"),
 		h.Attribute("role", "status"),
 	)