Simplify code

Author: JordanMartinez

richtextfx/src/main/java/org/fxmisc/richtext/model/EditableStyledDocument.java

@@ -45,9 +45,9 @@ public interface EditableStyledDocument<PS, SEG, S> extends StyledDocument<PS, S
 
     default EventStream<PlainTextChange> plainChanges() {
         return richChanges()
-                .map(c -> new PlainTextChange(c.position, c.removed.getText(), c.inserted.getText()))
+                .map(RichTextChange::toPlainTextChange)
                 // filter out rich changes where the style was changed but text wasn't added/removed
-                .filter(pc -> !pc.removed.equals(pc.inserted));
+                .filter(pc -> !pc.isIdentity());
     }
 
     EventStream<RichTextChange<PS, SEG, S>> richChanges();

richtextfx/src/main/java/org/fxmisc/richtext/model/RichTextChange.java

@@ -30,4 +30,8 @@ protected final StyledDocument<PS, SEG, S> sub(StyledDocument<PS, SEG, S> doc, i
     protected final RichTextChange<PS, SEG, S> create(int position, StyledDocument<PS, SEG, S> removed, StyledDocument<PS, SEG, S> inserted) {
         return new RichTextChange<>(position, removed, inserted);
     }
+
+    public final PlainTextChange toPlainTextChange() {
+        return new PlainTextChange(position, removed.getText(), inserted.getText());
+    }
 }