Use ng-select for document detail screen

src-ui/src/app/app.module.ts

@@ -54,6 +54,7 @@ import { FileSizePipe } from './pipes/file-size.pipe';
 import { FilterPipe } from './pipes/filter.pipe';
 import { DocumentTitlePipe } from './pipes/document-title.pipe';
 import { MetadataCollapseComponent } from './components/document-detail/metadata-collapse/metadata-collapse.component';
+import { NgSelectModule } from '@ng-select/ng-select';
 
 @NgModule({
   declarations: [
@@ -110,7 +111,8 @@ import { MetadataCollapseComponent } from './components/document-detail/metadata
     ReactiveFormsModule,
     NgxFileDropModule,
     InfiniteScrollModule,
-    PdfViewerModule
+    PdfViewerModule,
+    NgSelectModule
   ],
   providers: [
     DatePipe,

src-ui/src/app/components/common/input/select/select.component.html

@@ -1,11 +1,15 @@
-<div class="form-group">
+<div class="form-group paperless-input-select">
   <label [for]="inputId">{{title}}</label>
   <div [class.input-group]="showPlusButton()">
-    <select class="form-control" [id]="inputId" [(ngModel)]="value" (change)="onChange(value)" (blur)="onTouched()"
-      [disabled]="disabled" [style.color]="textColor" [style.background]="backgroundColor">
-      <option *ngIf="allowNull" [ngValue]="null" class="form-control">---</option>
-      <option *ngFor="let i of items" [ngValue]="i.id" class="form-control">{{i.name}}</option>
-    </select>
+    <ng-select name="correspondent" [(ngModel)]="value"
+      [disabled]="disabled"
+      [style.color]="textColor"
+      [style.background]="backgroundColor"
+      (change)="onChange(value)"
+      (blur)="onTouched()">
+      <ng-option *ngFor="let i of items" [value]="i.id">{{i.name}}</ng-option>
+    </ng-select>
+
     <div *ngIf="showPlusButton()" class="input-group-append">
       <button class="btn btn-outline-secondary" type="button" (click)="createNew.emit()">
         <svg class="buttonicon" fill="currentColor">
@@ -15,4 +19,4 @@
     </div>
   </div>
   <small *ngIf="hint" class="form-text text-muted">{{hint}}</small>
-</div>
+</div>

src-ui/src/app/components/common/input/select/select.component.scss

@@ -0,0 +1 @@
+// styles for ng-select child are in styles.scss

src-ui/src/styles.scss

@@ -2,6 +2,7 @@
 
 @import "node_modules/bootstrap/scss/bootstrap";
 
+@import "~@ng-select/ng-select/themes/default.theme.css";
 
 .toolbaricon {
   width: 1.2em;
@@ -65,4 +66,24 @@ body {
   display: block;
   background-size: 1rem;
   float: right;
-}
+}
+
+.paperless-input-select {
+  .ng-select {
+    position: relative;
+    flex: 1 1 auto;
+    margin-bottom: 0;
+    height: calc(1.5em + 0.75rem + 5px);
+    line-height: 1.5;
+
+    .ng-select-container {
+      height: 100%;
+      border-top-right-radius: 0;
+      border-bottom-right-radius: 0;
+
+      .ng-value-container .ng-input {
+        top: 8px;
+      }
+    }
+  }
+}