commit 28eca2fc4a093ee751cf49c8087e6bb09a02ae44
from: Omar Polo <op@omarpolo.com>
date: Sun Jun 20 21:00:52 2021 UTC

fix cmd_scroll_line_up

buffer->current_line *IS NOT* the first line at the top of the
window...

commit - 7f963c410faa911376fc67144d2ca817d7cfeae8
commit + 28eca2fc4a093ee751cf49c8087e6bb09a02ae44
blob - b2b5ba11415b0529872c05bb984076dcc8674f38
blob + d513d833c89215eaee35acec350856495dab3762
--- cmd.c
+++ cmd.c
@@ -134,16 +134,14 @@ cmd_redraw(struct buffer *buffer)
 void
 cmd_scroll_line_up(struct buffer *buffer)
 {
-	struct vline	*vl;
-
 	if (buffer->current_line == NULL)
 		return;
 
-	if ((vl = TAILQ_PREV(buffer->current_line, vhead, vlines)) == NULL)
+	if (buffer->line_off == 0)
 		return;
 
-	buffer->current_line = vl;
 	buffer->line_off--;
+	buffer->current_line = TAILQ_PREV(buffer->current_line, vhead, vlines);
 	restore_cursor(buffer);
 }