[editor]Add new special character to TextEditor: thin non-breaking space

projects/editor/src/app/text-editor/rich-text-editor.component.html

@@ -208,6 +208,8 @@
       <mat-menu #specialCharsMenu="matMenu" yPosition="above">
         <button mat-button (click)="insertSpecialChar('&nbsp;')"
                 [matTooltip]="'Geschütztes Leerzeichen'">&blank;</button>
+        <button mat-button (click)="insertSpecialChar('&#8239;')"
+                [matTooltip]="'Geschütztes Leerzeichen (schmal)'">&blank;<sub>2</sub></button>
         <button mat-button (click)="insertSpecialChar('&ndash;')">&ndash;</button>
         <button mat-button (click)="insertSpecialChar('&female;')">&female;</button>
         <button mat-button (click)="insertSpecialChar('&male;')">&male;</button>