user/setting: preserve user input with validation error (#1123)

modules/context/context.go

@@ -79,12 +79,17 @@ func (ctx *Context) HasValue(name string) bool {
 	return ok
 }
 
-// HTML calls Context.HTML and converts template name to string.
+// HTML responses template with given status.
 func (ctx *Context) HTML(status int, name base.TplName) {
 	log.Trace("Template: %s", name)
 	ctx.Context.HTML(status, string(name))
 }
 
+// Success responses template with status 200.
+func (c *Context) Success(name base.TplName) {
+	c.HTML(200, name)
+}
+
 // RenderWithErr used for page has form validation but need to prompt error to users.
 func (ctx *Context) RenderWithErr(msg string, tpl base.TplName, f interface{}) {
 	if f != nil {