Listen to change events for setting dirty status of database (#3001)

* Listen to change events for setting dirty status of database

* Use a single listener instance

* Merge DatabaseChangeListener into BasePanel

* Add changelog entry

CHANGELOG.md

@@ -43,6 +43,7 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 - We fixed a bug where recursive RegExpBased search found a file in a subdirectory multiple times and non-recursive RegExpBased search erroneously found files in subdirectories.
 - We fixed a bug where new groups information was not stored on save [#2932](https://github.com/JabRef/jabref/issues/2932)
 - We fixed a bug where the language files for Brazilian Portugese could not be loaded and the GUI localization remained in English [#1128](https://github.com/JabRef/jabref/issues/1182)
+- We fixed a bug where the database was not marked as dirty when entries or groups were changed [#2787](https://github.com/JabRef/jabref/issues/2787)
 
 ### Removed
 

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

@@ -126,6 +126,7 @@
 import org.jabref.model.database.BibDatabaseContext;
 import org.jabref.model.database.DatabaseLocation;
 import org.jabref.model.database.KeyCollisionException;
+import org.jabref.model.database.event.BibDatabaseContextChangedEvent;
 import org.jabref.model.database.event.EntryAddedEvent;
 import org.jabref.model.database.event.EntryRemovedEvent;
 import org.jabref.model.entry.BibEntry;
@@ -204,6 +205,8 @@ public BasePanel(JabRefFrame frame, BibDatabaseContext bibDatabaseContext) {
         Objects.requireNonNull(bibDatabaseContext);
 
         this.bibDatabaseContext = bibDatabaseContext;
+        bibDatabaseContext.getDatabase().registerListener(this);
+        bibDatabaseContext.getMetaData().registerListener(this);
 
         this.sidePaneManager = frame.getSidePaneManager();
         this.frame = frame;
@@ -259,6 +262,11 @@ public static void runWorker(AbstractWorker worker) throws Exception {
         clb.update(); // Runs the update() method on the EDT.
     }
 
+    @Subscribe
+    public void listen(BibDatabaseContextChangedEvent event) {
+        this.markBaseChanged();
+    }
+
     /**
      * Returns a collection of suggestion providers, which are populated from the current library.
      */