Try to relocate listener binding

src/main/java/org/jabref/gui/JabRefFrame.java

@@ -659,6 +659,15 @@ public void init() {
         Platform.runLater(() -> stateManager.focusOwnerProperty().bind(
                 EasyBind.map(mainStage.getScene().focusOwnerProperty(), Optional::ofNullable)));
 
+        EasyBind.subscribe(tabbedPane.getSelectionModel().selectedItemProperty(), selectedTab -> {
+            if (selectedTab instanceof LibraryTab libraryTab) {
+                stateManager.setActiveDatabase(libraryTab.getBibDatabaseContext());
+            } else if (selectedTab == null) {
+                // All databases are closed
+                stateManager.setActiveDatabase(null);
+            }
+        });
+
         /*
          * The following state listener makes sure focus is registered with the
          * correct database when the user switches tabs. Without this,
@@ -1184,7 +1193,8 @@ private boolean confirmClose(LibraryTab libraryTab) {
                 }
                 // The action was either canceled or unsuccessful.
                 dialogService.notify(Localization.lang("Unable to save library"));
-            } catch (Throwable ex) {
+            } catch (
+                    Throwable ex) {
                 LOGGER.error("A problem occurred when trying to save the file", ex);
                 dialogService.showErrorDialogAndWait(Localization.lang("Save library"), Localization.lang("Could not save file."), ex);
             }
@@ -1226,7 +1236,8 @@ private Boolean confirmEmptyEntry(LibraryTab libraryTab, BibDatabaseContext cont
                 }
                 // The action was either canceled or unsuccessful.
                 dialogService.notify(Localization.lang("Unable to save library"));
-            } catch (Throwable ex) {
+            } catch (
+                    Throwable ex) {
                 LOGGER.error("A problem occurred when trying to delete the empty entries", ex);
                 dialogService.showErrorDialogAndWait(Localization.lang("Delete empty entries"), Localization.lang("Could not delete empty entries."), ex);
             }
@@ -1370,7 +1381,8 @@ public void execute() {
             Optional.of(databaseContext.get()).flatMap(BibDatabaseContext::getDatabasePath).ifPresent(path -> {
                 try {
                     JabRefDesktop.openFolderAndSelectFile(path, prefs, dialogService);
-                } catch (IOException e) {
+                } catch (
+                        IOException e) {
                     LOGGER.info("Could not open folder", e);
                 }
             });

src/main/java/org/jabref/gui/LibraryTab.java

@@ -226,14 +226,6 @@ public void onDatabaseLoadingSucceed(ParserResult result) {
                 LOGGER.error("Cannot access lucene index", e);
             }
         }
-
-        // a temporary workaround to update groups pane
-        stateManager.activeDatabaseProperty().bind(
-                EasyBind.map(frame.getTabbedPane().getSelectionModel().selectedItemProperty(),
-                        selectedTab -> Optional.ofNullable(selectedTab)
-                                               .filter(tab -> tab instanceof LibraryTab)
-                                               .map(tab -> (LibraryTab) tab)
-                                               .map(LibraryTab::getBibDatabaseContext)));
     }
 
     public void onDatabaseLoadingFailed(Exception ex) {
@@ -247,6 +239,7 @@ public void feedData(BibDatabaseContext bibDatabaseContext) {
         cleanUp();
 
         this.bibDatabaseContext = Objects.requireNonNull(bibDatabaseContext);
+        stateManager.setActiveDatabase(bibDatabaseContext);
 
         bibDatabaseContext.getDatabase().registerListener(this);
         bibDatabaseContext.getMetaData().registerListener(this);

src/main/java/org/jabref/gui/StateManager.java

@@ -34,6 +34,8 @@
 
 import com.tobiasdiez.easybind.EasyBind;
 import com.tobiasdiez.easybind.EasyBinding;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * This class manages the GUI-state of JabRef, including:
@@ -49,6 +51,7 @@
  */
 public class StateManager {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(StateManager.class);
     private final CustomLocalDragboard localDragboard = new CustomLocalDragboard();
     private final ObservableList<BibDatabaseContext> openDatabases = FXCollections.observableArrayList();
     private final OptionalObjectProperty<BibDatabaseContext> activeDatabase = OptionalObjectProperty.empty();
@@ -129,6 +132,15 @@ public Optional<BibDatabaseContext> getActiveDatabase() {
         return activeDatabase.get();
     }
 
+    public void setActiveDatabase(BibDatabaseContext database) {
+        if (database == null) {
+            LOGGER.info("No open database detected");
+            activeDatabaseProperty().set(Optional.empty());
+        } else {
+            activeDatabaseProperty().set(Optional.of(database));
+        }
+    }
+
     public List<BibEntry> getEntriesInCurrentDatabase() {
         return OptionalUtil.flatMap(activeDatabase.get(), BibDatabaseContext::getEntries)
                            .collect(Collectors.toList());

src/main/java/org/jabref/gui/importer/NewEntryAction.java

@@ -24,11 +24,14 @@ public class NewEntryAction extends SimpleCommand {
     private static final Logger LOGGER = LoggerFactory.getLogger(NewEntryAction.class);
 
     private final JabRefFrame jabRefFrame;
+
     /**
      * The type of the entry to create.
      */
     private Optional<EntryType> type;
+
     private final DialogService dialogService;
+
     private final PreferencesService preferences;
 
     public NewEntryAction(JabRefFrame jabRefFrame, DialogService dialogService, PreferencesService preferences, StateManager stateManager) {