Treat unknown fields as multi-line fields (#5230)

Fixes #5021. Unknown fields are now treated as multi-line fields. In the future, we should provide an UI interface to specify or change properties of fields.

Author: tobiasdiez

src/main/java/org/jabref/gui/fieldeditors/FieldEditors.java

@@ -90,14 +90,12 @@ public static FieldEditorFX getForField(final Field field,
             return new PersonsEditor(field, suggestionProvider, preferences, fieldCheckers, isSingleLine);
         } else if (StandardField.KEYWORDS.equals(field)) {
             return new KeywordsEditor(field, suggestionProvider, fieldCheckers, preferences);
-        } else if (fieldProperties.contains(FieldProperty.MULTILINE_TEXT)) {
-            return new MultilineEditor(field, suggestionProvider, fieldCheckers, preferences);
         } else if (field == InternalField.KEY_FIELD) {
             return new BibtexKeyEditor(field, preferences, suggestionProvider, fieldCheckers, databaseContext, undoManager, dialogService);
+        } else {
+            // default
+            return new SimpleEditor(field, suggestionProvider, fieldCheckers, preferences, isSingleLine);
         }
-
-        // default
-        return new SimpleEditor(field, suggestionProvider, fieldCheckers, preferences, isSingleLine);
     }
 
     @SuppressWarnings("unchecked")

src/main/java/org/jabref/gui/fieldeditors/MultilineEditor.java

@@ -139,7 +139,13 @@ public static List<Field> getDefaultGeneralFields() {
         return defaultGeneralFields;
     }
 
+    // TODO: Move somewhere more appropriate and make user-configurable
     public static boolean isSingleLineField(final Field field) {
-        return !field.getProperties().contains(FieldProperty.MULTILINE_TEXT);
+        if (field.equals(StandardField.ABSTRACT) || field.equals(StandardField.COMMENT)) {
+            return false;
+        }
+
+        // Treat unknown fields as multi-line fields
+        return !(field instanceof UnknownField);
     }
 }

src/main/java/org/jabref/model/entry/field/FieldFactory.java

@@ -13,7 +13,6 @@ public enum FieldProperty {
     JOURNAL_NAME,
     LANGUAGE,
     MONTH,
-    MULTILINE_TEXT,
     MULTIPLE_ENTRY_LINK,
     NUMERIC,
     PAGES,

src/main/java/org/jabref/model/entry/field/FieldProperty.java

@@ -11,7 +11,7 @@
  */
 public enum StandardField implements Field {
 
-    ABSTRACT("abstract", FieldProperty.MULTILINE_TEXT),
+    ABSTRACT("abstract"),
     ADDENDUM("addendum"),
     ADDRESS("address"),
     AFTERWORD("afterword", FieldProperty.PERSON_NAMES),
@@ -28,7 +28,7 @@ public enum StandardField implements Field {
     BOOKTITLEADDON("booktitleaddon"),
     CHAPTER("chapter"),
     COMMENTATOR("commentator", FieldProperty.PERSON_NAMES),
-    COMMENT("comment", FieldProperty.MULTILINE_TEXT),
+    COMMENT("comment"),
     CROSSREF("crossref", FieldProperty.SINGLE_ENTRY_LINK),
     DATE("date", FieldProperty.DATE),
     DAY("day"),