Fix fetcher worker execution on background thread

Author: Siedlerchr

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

@@ -16,6 +16,7 @@
 
 import org.jabref.gui.externalfiles.ImportHandler;
 import org.jabref.gui.importer.NewEntryAction;
+import org.jabref.gui.util.DefaultTaskExecutor;
 import org.jabref.gui.util.TaskExecutor;
 import org.jabref.logic.importer.FetcherClientException;
 import org.jabref.logic.importer.FetcherException;
@@ -24,6 +25,7 @@
 import org.jabref.logic.importer.WebFetchers;
 import org.jabref.logic.importer.fetcher.DoiFetcher;
 import org.jabref.logic.l10n.Localization;
+import org.jabref.logic.layout.format.Default;
 import org.jabref.model.entry.BibEntry;
 import org.jabref.model.entry.types.StandardEntryType;
 import org.jabref.model.strings.StringUtil;
@@ -131,7 +133,6 @@ private class FetcherWorker extends Task<Optional<BibEntry>> {
 
         @Override
         protected Optional<BibEntry> call() throws FetcherException {
-            searchingProperty().setValue(true);
             storeSelectedFetcher();
             fetcher = selectedItemProperty().getValue();
             searchID = idText.getValue();
@@ -144,7 +145,8 @@ protected Optional<BibEntry> call() throws FetcherException {
 
     public void runFetcherWorker() {
         searchSuccesfulProperty.set(false);
-        fetcherWorker.run();
+        searchingProperty().setValue(true);
+        taskExecutor.execute(fetcherWorker);
         fetcherWorker.setOnFailed(event -> {
             Throwable exception = fetcherWorker.getException();
             String fetcherExceptionMessage = exception.getMessage();