commit 7102f5d94d510ebd2af6b36c075d3c338a7dc338
from: Omar Polo <op@omarpolo.com>
date: Wed Jul 21 14:45:08 2021 UTC

recompute help only when needed

commit - 54ee0a94b6caabb0346274480b28c8dd0920deed
commit + 7102f5d94d510ebd2af6b36c075d3c338a7dc338
blob - 3678f6a8d826dcfd4cca64216876d8285deb85ca
blob + feff40f2d0a90f9370a0a962f0aebd390490ef54
--- help.c
+++ help.c
@@ -78,9 +78,14 @@ rec_compute_help(struct kmap *keymap, char *prfx, size
 void
 recompute_help(void)
 {
+	static struct kmap *last_active_map = NULL;
 	char	p[32] = { 0 };
 
-	erase_buffer(&helpwin);
-	rec_compute_help(current_map, p, sizeof(p));
-	wrap_page(&helpwin, help_cols);
+	if (last_active_map != current_map) {
+		last_active_map = current_map;
+
+		erase_buffer(&helpwin);
+		rec_compute_help(current_map, p, sizeof(p));
+		wrap_page(&helpwin, help_cols);
+	}
 }