[dev-issue-6369]Added the "scrollable" feature for the Bootstrap Modal tag helper.

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalTagHelper.cs

@@ -6,6 +6,8 @@
 
         public bool? Centered { get; set; } = false;
 
+        public bool? Scrollable { get; set; } = false;
+
         public bool? Static { get; set; } = false;
 
         public AbpModalTagHelper(AbpModalTagHelperService tagHelperService)

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Bootstrap/TagHelpers/Modal/AbpModalTagHelperService.cs

@@ -78,6 +78,12 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.TagHelpers.Modal
                 classNames.Append("modal-dialog-centered");
             }
 
+            if (TagHelper.Scrollable ?? false)
+            {
+                classNames.Append(" ");
+                classNames.Append("modal-dialog-scrollable");
+            }
+
             if (TagHelper.Size != AbpModalSize.Default)
             {
                 classNames.Append(" ");