removed redundant method and constant

src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/AbpTagHelperService.cs

@@ -16,7 +16,6 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers
         where TTagHelper : TagHelper
     {
         protected const string FormGroupContents = "FormGroupContents";
-        protected const string DropdownButtonsAsHtml = "DropdownButtonsAsHtmlContent";
         protected const string TabItems = "TabItems";
         protected const string AccordionItems = "AccordionItems";
         protected const string BreadcrumbItemsContent = "BreadcrumbItemsContent";

src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Dropdown/AbpDropdownTagHelperService.cs

@@ -6,7 +6,7 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Dropdown
 {
     public class AbpDropdownTagHelperService : AbpTagHelperService<AbpDropdownTagHelper>
     {
-        public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
+        public override void Process(TagHelperContext context, TagHelperOutput output)
         {
             output.TagName = "div";
             output.Attributes.AddClass("btn-group");
@@ -16,11 +16,6 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Dropdown
             output.TagMode = TagMode.StartTagAndEndTag;
         }
 
-        protected virtual string GetButtonsAsHtml(TagHelperContext context, TagHelperOutput output)
-        {
-            return context.Items[DropdownButtonsAsHtml] as string;
-        }
-
         protected virtual void SetDirection(TagHelperContext context, TagHelperOutput output)
         {
             switch (TagHelper.Direction)

src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/ListGroup/AbpListGroupItemTagHelperService.cs

@@ -37,7 +37,6 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.ListGroup
         {
             output.Attributes.AddClass("list-group-item");
 
-
             if (TagHelper.Active ?? false) output.Attributes.AddClass("active");
             if (TagHelper.Disabled ?? false) output.Attributes.AddClass("disabled");
             if (TagHelper.Type != AbpListItemType.Default) { output.Attributes.AddClass("list-group-item-" + TagHelper.Type.ToString().ToLowerInvariant()); }