terminology - fix double click selection and jed display

this fixes breaks introduced by
e94051dd86 (the previous commit).

latest commit: e94051dd86

breaks 2 things.

1. double-click to select a "word" is broken. the right end of the selection is
stuck at the point where the cursor is, not the right end of the word. try it.
at least that is what i see. either way double-click to select a word is now
broken. ;(

2. what used to be black whitespace bg is now "empty" chars (so i see
terminology bg). this breaks jed output pretty badly.

see...

working:
http://www.enlightenment.org/ss/e-54d05f357a3391.24747752.png

not working:
http://www.enlightenment.org/ss/e-54d05f672a4df7.83729511.png

src/bin/termpty.c

@@ -631,11 +631,10 @@ termpty_cellrow_get(Termpty *ty, int y, int *wret)
 
    if (y >= 0)
      {
-        Termcell *cells;
         if (y >= ty->h) return NULL;
-        cells = &(TERMPTY_SCREEN(ty, 0, y));
-        *wret = termpty_line_length(cells, ty->w);
-        return cells;
+        *wret = ty->w;
+        /* fprintf(stderr, "getting: %i (%i, %i)\n", y, ty->circular_offset, ty->h); */
+        return &(TERMPTY_SCREEN(ty, 0, y));
      }
    if ((y < -ty->backmax) || !ty->back) return NULL;
    tssrc = &(ty->back[(ty->backmax + ty->backpos + y) % ty->backmax]);