Do not fire redraw callback if NULL.

diff --git a/usr.bin/tmux/screen-write.c b/usr.bin/tmux/screen-write.c
index 5fcb8e0..3880577 100644 (file)
--- a/usr.bin/tmux/screen-write.c
+++ b/usr.bin/tmux/screen-write.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: screen-write.c,v 1.209 2022/08/02 11:09:26 nicm Exp $ */
+/* $OpenBSD: screen-write.c,v 1.210 2022/10/25 09:04:49 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1505,8 +1505,10 @@ screen_write_fullredraw(struct screen_write_ctx *ctx)
 
        screen_write_collect_flush(ctx, 0, __func__);
 
-       screen_write_initctx(ctx, &ttyctx, 1);
-       ttyctx.redraw_cb(&ttyctx);
+       if (ttyctx.redraw_cb != NULL) {
+               screen_write_initctx(ctx, &ttyctx, 1);
+               ttyctx.redraw_cb(&ttyctx);
+       }
 }
 
 /* Trim collected items. */
@@ -2127,8 +2129,10 @@ screen_write_alternateon(struct screen_write_ctx *ctx, struct grid_cell *gc,
        screen_write_collect_flush(ctx, 0, __func__);
        screen_alternate_on(ctx->s, gc, cursor);
 
-       screen_write_initctx(ctx, &ttyctx, 1);
-       ttyctx.redraw_cb(&ttyctx);
+       if (ttyctx.redraw_cb != NULL) {
+               screen_write_initctx(ctx, &ttyctx, 1);
+               ttyctx.redraw_cb(&ttyctx);
+       }
 }
 
 /* Turn alternate screen off. */
@@ -2145,6 +2149,8 @@ screen_write_alternateoff(struct screen_write_ctx *ctx, struct grid_cell *gc,
        screen_write_collect_flush(ctx, 0, __func__);
        screen_alternate_off(ctx->s, gc, cursor);
 
-       screen_write_initctx(ctx, &ttyctx, 1);
-       ttyctx.redraw_cb(&ttyctx);
+       if (ttyctx.redraw_cb != NULL) {
+               screen_write_initctx(ctx, &ttyctx, 1);
+               ttyctx.redraw_cb(&ttyctx);
+       }
 }