[3.0] Update double tap and long press behaviour.

[3.0] Update double tap and long press behaviour.

It updates the double tap and long press event on a text area with no text.
i.e. On a position clearly after the last character of the text.

* Double Tap : The cursor is placed at the beginning or at the end of the text.
* Long Press : The cursor is placed at the beginning or at the end of the text and shows the text's selection popup.

Change-Id: Iaf9ea817a515781d20c87f60991e1996d5440a62
Signed-off-by: Victor Cebollada <v.cebollada@samsung.com>