Fix long dropdown contents break column layout

src-ui/src/app/components/document-detail/document-detail.component.html

@@ -63,7 +63,7 @@
 
 
 <div class="row">
-    <div class="col mb-4">
+    <div class="col-md-6 col-xl-4 mb-4">
 
         <form [formGroup]='documentForm' (ngSubmit)="save()">
 

src-ui/src/app/components/document-detail/document-detail.component.scss

@@ -22,6 +22,10 @@
   --page-margin: 1px 0 20px;
 }
 
+::ng-deep .ng-select-taggable {
+  max-width: calc(100% - 46px); // fudge factor for ng-select button width
+}
+
 .password-prompt {
   position: absolute;
   top: 30%;