fixed: caret is invisible at the end of the line

AppKit/CPTextView/CPTextView.j

@@ -2298,6 +2298,9 @@ Sets the selection to a range of characters in response to user action.
     caretRect.origin.x += _textContainerOrigin.x;
     caretRect.origin.y += _textContainerOrigin.y;
 
+    caretRect.size.width = MAX(1.0, caretRect.size.width);
+    caretRect.size.height = MAX(1.0, caretRect.size.height);
+
     return caretRect;
 }
 - (void)updateInsertionPointStateAndRestartTimer:(BOOL)flag