bug#19395: 25.0.50; Setting left fringe to 0 messes up window-width

[Stefan Monnier]

>> >   |left-to-right continued line |⤶
>> >   |/RIGHT-TO-LEFT CONTINUED LINE|
>> Why do you need the empty space at the end of the left-to-right line?
> Because that empty space simply doesn't exist in the display line's
> geometry, as far as the display engine is concerned.  Most of the
> display engine is oblivious to the fact that an RTL line is reversed
> on display, so it cannot do its job if some lines are longer than
> others.

IOW, it's because it makes the implementation easier.  OK, that's
a good reason.


        Stefan