8369085: RichTextArea SELECT_PARAGRAPH to include line separator

Reviewed-by: kcr

Author: Andy Goryachev

modules/jfx.incubator.richtext/src/main/java/com/sun/jfx/incubator/scene/control/richtext/RichTextAreaBehavior.java

@@ -910,7 +910,7 @@ public void selectParagraph() {
         if (p != null) {
             int ix = p.index();
             TextPos an = TextPos.ofLeading(ix, 0);
-            TextPos ca = control.getParagraphEnd(ix);
+            TextPos ca = TextPos.ofLeading(ix + 1, 0);
             control.select(an, ca);
         }
     }

modules/jfx.incubator.richtext/src/test/java/test/jfx/incubator/scene/control/richtext/RichTextAreaTest.java

@@ -642,6 +642,23 @@ public void selectAll() {
         assertEquals(end, sel.getMax());
     }
 
+    @Test
+    public void selectParagraph() {
+        control.appendText("123\n456\n789");
+        // first line
+        control.select(TextPos.ZERO);
+        control.selectParagraph();
+        SelectionSegment sel = control.getSelection();
+        assertEquals(TextPos.ZERO, sel.getMin());
+        assertEquals(TextPos.ofLeading(1, 0), sel.getMax());
+        // last line, no trailing line separator
+        control.select(TextPos.ofLeading(2, 0));
+        control.selectParagraph();
+        sel = control.getSelection();
+        assertEquals(TextPos.ofLeading(2, 0), sel.getMin());
+        assertEquals(new TextPos(2, 3, 2, false), sel.getMax());
+    }
+
     @Test
     public void undo() {
         control.appendText("1");