Re: "Final" version of tty child frames

[martin rudalics]

> Eli said cursor position < 0 means "don't know". Maybe try that?

I now subtract 1 from the w->cursor.hpos if glyph->charpos is larger
than PT and it seems to work with your terminal_cursor_magic.  So unless
there are more fundamental reasons to preserve obscured parts of frame
matrices, I think this problem can be fixed in set_cursor_from_row.

martin