Re: Mixed L2R and R2L paragraphs and horizontal scroll

 > Actually, if a R2L line displays text made mostly of strong R
 > characters (which is normally the case), the first character at the
 > right margin of the window is also the first character following the
 > newline in the buffer's logical order.

Unless it's horizontally scrolled.

 >> There is one thing I conceptually don't understand yet: When I currently
 >> shrink the width of a window Emacs doesn't hide text at the left side of
 >> the window but text at the right side may get truncated when the window
 >> becomes too small.  Will this behavior be reverted for R2L text in the
 >> sense that text at the left side is truncated?
 >
 > Yes, the truncation for R2L lines will happen at the left, and the
 > truncation glyph will be displayed there as well.  (It actually
 > already works like that, at least on a tty.)

It might be probably interesting for a user to dynamically switch during
typing whether a buffer should be dominantly displayed as R2L or L2R.

martin