sixel: Export $FZF_PREVIEW_TOP to the preview command (#2544)

So that it can determine if it should subtract 1 from $FZF_PREVIEW_LINES
to avoid scrolling issue of Sixel image that touches the bottom of the
screen.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/tui/light.go b/src/tui/light.go
index e9cf04eb..d26a48f6 100644
--- a/src/tui/light.go
+++ b/src/tui/light.go
@@ -720,6 +720,10 @@ func (r *LightRenderer) Close() {
 	r.restoreTerminal()
 }
 
+func (r *LightRenderer) Top() int {
+	return r.yoffset
+}
+
 func (r *LightRenderer) MaxX() int {
 	return r.width
 }