attempt to fix unit test for previous commit (select moved text after drag-and-drop)

Author: DevCharly

richtextfx/src/integrationTest/java/org/fxmisc/richtext/mouse/ClickAndDragTests.java

@@ -261,14 +261,15 @@ public void pressingMouseOnSelectionAndDraggingAndReleasingMovesSelectedTextToTh
                     area.selectRange(0, firstWord.length());
                 });
 
+                String selText = area.getSelectedText();
                 int caretPos = area.getCaretPosition();
 
                 moveTo(firstLineOfArea())
                         .press(PRIMARY)
                         .dropBy(0, 14);
 
                 assertTrue(caretPos != area.getCaretPosition());
-                assertTrue(area.getSelectedText().isEmpty());
+                assertEquals(selText, area.getSelectedText());
             }
 
         }