Fix overlay position mapping in split windows

Compute overlay screen positions in the window currently being refreshed
instead of choosing an arbitrary window that shows the same buffer.  This
keeps placements correct when a buffer is visible in more than one pane.

Also derive the terminal column from the overlay's buffer column rather
than posn-col-row.  In terminal Emacs, posn-col-row can describe the
right edge of display-property text instead of the logical overlay start,
which makes Sixel placements appear to the right of their reserved cells.

0 files changed, 0 insertions, 0 deletions