bug#19661: wrapping before window-width (new wrap-column text property?)

[martin rudalics]

> Sorry for being dense, this being just the first weekday for me, but
> what "windows code" does that, please?

The one that calculates the text size of windows.  Or did you read
"Windows code"?

> In any case, telling the display engine where to start the display is
> a far cry from telling it how to lay out the screen from that point
> onwards.

My point was to _not_ change the code of the display engine.

> Providing an API is not equivalent to implementing it.  In order for
> us to be able to provide such an API, the display engine should
> implement the support such an API will need.  And that's the hard part
> of the job -- how to perform this layout.  Once we figure that out,
> providing an API for controlling it will be easy.

It essentially would have to subdivide a window into rectangles.  And I
would do that on the window(s) level to avoid the hard part of the job.

martin