I was a number of screen widths to the right in a document.
I went to another document and turned on wrapping there.
I returned to the first document and had more or less the same view as before.
However, there was no way I could return to the beginning of a line in order to make the now wrapped text visible.

I could achieve this by unwrapping and wrapping again.
But I think the document should be scrolled back automatically, if wrapping was turned on in the meantime.