bug#17905: 24.3.50; writing with a giant font triggers RTL text entry

[Stefan Monnier]

>> - start with "emacs -Q"
>> - enlarge the font by shift-mouse and selecting "Increase Buffer
>> Text Size" N times (please tell what is the value of N)
>> - type the following text: ....

> ... where N=12 was a value that triggered the effect for me.  Also
> note that the Emacs window was full-screen.

Ah, yes, I can reproduce it: it's not RTL-rendering.
It's some issue with cursor positioning, such that after some
line-wrapping, when you enter a char, somehow point ends up before the
new char rather than after, so you end up typing "backwards".


        Stefan