Fixed preset-checklist userfield saving (fixes #2655)

changelog/78_UNRELEASED_xxxx-xx-xx.md

@@ -48,7 +48,7 @@
 
 ### Userfields
 
-- xxx
+- Fixed that saving Userfields of type "Select list (multiple items can be selected)" did not work
 
 ### General
 

public/viewjs/components/userfieldsform.js

@@ -394,3 +394,8 @@ $(".userfield-input").change(function(e)
 		Grocy.FrontendHelpers.ValidateForm(this.id);
 	});
 });
+
+$(".userfield-input.selectpicker").on("changed.bs.select", function()
+{
+	$(this).addClass("is-dirty");
+});