reduce calls to win-title

rather than calling the script unconditionally per redraw, we now have
a `title_dirty` flag and keep track of when any of the relavent
information changes.

Co-authored-by: Arthur Williams <taaparthur@gmail.com>
Partially fixes: https://github.com/nsxiv/nsxiv/issues/258

1 files changed, 2 insertions, 0 deletions

diff --git a/thumbs.c b/thumbs.c
index 52820d4..8ca0c58 100644
--- a/thumbs.c
+++ b/thumbs.c
@@ -459,6 +459,7 @@ void tns_render(tns_t *tns)
 	}
 	tns->dirty = false;
 	tns_highlight(tns, *tns->sel, true);
+	title_dirty = true;
 }
 
 void tns_mark(tns_t *tns, int n, bool mark)
@@ -527,6 +528,7 @@ bool tns_move_selection(tns_t *tns, direction_t dir, int cnt)
 		tns_check_view(tns, false);
 		if (!tns->dirty)
 			tns_highlight(tns, *tns->sel, true);
+		title_dirty = true;
 	}
 	return *tns->sel != old;
 }