Resort the strings table for new entry

Adding a new entry should also preserve the sorting of the strings
table, thus we need to resort the entries and take care that the focus
in the table is still on the newly-created entry.

src/main/java/org/jabref/gui/libraryproperties/constants/ConstantsPropertiesView.java

@@ -77,7 +77,14 @@ public void initialize() {
                 cellItem.setLabel(cellEvent.getNewValue());
             }
 
-            cellEvent.getTableView().refresh();
+            // Resort the entries based on the keys and set the focus to the newly-created entry
+            viewModel.resortStrings();
+            var selectionModel = cellEvent.getTableView().getSelectionModel();
+            var tableView = cellEvent.getTableView();
+            selectionModel.select(cellItem);
+            selectionModel.focus(selectionModel.getSelectedIndex());
+            tableView.refresh();
+            tableView.scrollTo(cellItem);
         });
 
         contentColumn.setSortable(true);

src/main/java/org/jabref/gui/libraryproperties/constants/ConstantsPropertiesViewModel.java

@@ -1,5 +1,7 @@
 package org.jabref.gui.libraryproperties.constants;
 
+import java.util.Comparator;
+import java.util.Locale;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
@@ -70,6 +72,11 @@ public void removeString(ConstantsItemModel item) {
         stringsListProperty.remove(item);
     }
 
+    public void resortStrings() {
+        // Resort the strings list in the same order as setValues() does
+        stringsListProperty.sort(Comparator.comparing(c -> c.labelProperty().get().toLowerCase(Locale.ROOT)));
+    }
+
     private ConstantsItemModel convertFromBibTexString(BibtexString bibtexString) {
         return new ConstantsItemModel(bibtexString.getName(), bibtexString.getContent());
     }