Fixed invalid display of handlers for R2L languages

Fixed invalid display of handlers for R2L languages

[Title] Fixed invalid display of handlers for R2L languages
[Issue#] WEB-3433, WEB-3434
[Problem] Long press and extend the selection to multiple lines
    then the first selected lies getting cleared
[Cause] Handles were drawn according to the selection rects. In all
    cases the bottom left of 1st rect and bottom right of last rect
    was used for drawing handlers. This is correct in case of L2R
    languages as the base of selection will be at start of 1st rect
    and extent at the end of last rect, but in case of R2L languages
    the base is at the end of 1st rect and the extent is at the start
    of the last rect
[Solution] Obtained the direction of selected text from
    frameselection and depending on the selection direction if the
    language is R2L draw the handlers at end of 1st rect and start
    of the last rect.

Change-Id: I4528b7b5744e3db30cdae42d90f2201f326271d4