commit 6e6c6afb3ab80111a7b6a873834659c0df8cf7a1
from: Omar Polo <op@omarpolo.com>
date: Wed Jul 14 20:35:00 2021 UTC

fix (some) offset mis-calculations

commit - 87f7918db232f45516ff314a7e30b4009196fc1a
commit + 6e6c6afb3ab80111a7b6a873834659c0df8cf7a1
blob - 74b0f596b190da9014ca05d7eb6fe63bdd0aa8cb
blob + 62558fb313faf3888287a234a1e10431bfa815b1
--- cmd.c
+++ cmd.c
@@ -52,8 +52,10 @@ forward_line(struct buffer *buffer, int n)
 				return did;
 			if (vl->parent->flags & L_HIDDEN)
 				continue;
-			if (buffer->current_line == buffer->top_line)
+			if (buffer->current_line == buffer->top_line) {
+				buffer->line_off--;
 				buffer->top_line = vl;
+			}
 			buffer->current_line = vl;
 			n++;
 		}
@@ -152,7 +154,6 @@ cmd_scroll_line_up(struct buffer *buffer)
 
 	forward_line(buffer, -1);
 
-	buffer->line_off--;
 	buffer->top_line = vl;
 }
 
@@ -218,6 +219,10 @@ cmd_push_button(struct buffer *buffer)
 			if (l->type == LINE_PRE_END)
 				break;
 			l->flags ^= L_HIDDEN;
+			if (l->flags & L_HIDDEN)
+				buffer->line_max--;
+			else
+				buffer->line_max++;
 		}
 		break;
 	default:
blob - cf6d51f34bd83d0c7f24647f255e03c028f98c6c
blob + 6b0c182475640190da132d9a8c0e6a30fb88d278
--- wrap.c
+++ wrap.c
@@ -82,7 +82,8 @@ push_line(struct buffer *buffer, struct line *l, const
 {
 	struct vline *vl;
 
-	buffer->line_max++;
+	if (!(l->flags & L_HIDDEN))
+		buffer->line_max++;
 
 	if ((vl = calloc(1, sizeof(*vl))) == NULL)
 		return 0;