Reformat BibTex in Show BibTex Source (#13761)

* fix(ui): format BibTeX shown in import dialog source view

* Add CHANGELOG.md entry

---------

Co-authored-by: Oliver Kopp <[email protected]>

Author: harii55

CHANGELOG.md

@@ -73,6 +73,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We improved JabRef's internal document viewer. It now allows text section, searching and highlighting of search terms and page rotation [#13193](https://github.com/JabRef/jabref/pull/13193).
 - When importing a PDF, there is no empty entry column shown in the multi merge dialog. [#13132](https://github.com/JabRef/jabref/issues/13132)
 - We added a progress dialog to the "Check consistency" action and progress output to the corresponding cli command. [#12487](https://github.com/JabRef/jabref/issues/12487)
+- The BibTeX source is now formatted using the JabRef style at the import inspection dialog. [#13015](https://github.com/JabRef/jabref/issues/13015)
 - We made the `check-consistency` command of the toolkit always return an exit code; 0 means no issues found, a non-zero exit code reflects any issues, which allows CI to fail in these cases [#13328](https://github.com/JabRef/jabref/issues/13328).
 - We changed the validation error dialog for overriding the default file directories to a confirmation dialog for saving other preferences under the library properties. [#13488](https://github.com/JabRef/jabref/pull/13488)
 - We made the copy sub menu on the context menu consistent with the copy sub menu at "Edit". [#13280](https://github.com/JabRef/jabref/pull/13280)

jabgui/src/main/java/org/jabref/gui/importer/ImportEntriesViewModel.java

@@ -125,9 +125,11 @@ public String getSourceString(BibEntry entry) {
         BibWriter bibWriter = new BibWriter(writer, OS.NEWLINE);
         FieldWriter fieldWriter = FieldWriter.buildIgnoreHashes(preferences.getFieldPreferences());
         try {
-            new BibEntryWriter(fieldWriter, entryTypesManager).write(entry, bibWriter, selectedDb.getValue().getMode());
+            // Force reformatting so the displayed BibTeX is consistently formatted
+            new BibEntryWriter(fieldWriter, entryTypesManager).write(entry, bibWriter, selectedDb.getValue().getMode(), true);
         } catch (IOException ioException) {
-            return "";
+            // In case of error, fall back to the original parsed serialization if available
+            return entry.getParsedSerialization();
         }
         return writer.toString();
     }