From bedf8bd4373c48761ae42dbd8635fbc65d1c5cf8 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Tue, 4 Jul 2017 12:26:14 +0000
Subject: [PATCH] Handle 0 size of preview box in caller.

---
 mode-tree.c   | 5 +++--
 window-tree.c | 4 ----
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/mode-tree.c b/mode-tree.c
index 10a56304..8ce4c403 100644
--- a/mode-tree.c
+++ b/mode-tree.c
@@ -445,7 +445,7 @@ void
 mode_tree_draw(struct mode_tree_data *mtd)
 {
 	struct window_pane	*wp = mtd->wp;
-	struct screen		*s = &mtd->screen, *box;
+	struct screen		*s = &mtd->screen, *box = NULL;
 	struct mode_tree_line	*line;
 	struct mode_tree_item	*mti;
 	struct options		*oo = wp->window->options;
@@ -571,7 +571,8 @@ mode_tree_draw(struct mode_tree_data *mtd)
 	box_x = w - 4;
 	box_y = sy - h - 2;
 
-	box = mtd->drawcb(mtd->modedata, mti->itemdata, box_x, box_y);
+	if (box_x != 0 && box_y != 0)
+		box = mtd->drawcb(mtd->modedata, mti->itemdata, box_x, box_y);
 	if (box != NULL) {
 		screen_write_cursormove(&ctx, 2, h + 1);
 		screen_write_copy(&ctx, box, 0, 0, box_x, box_y, NULL, NULL);
diff --git a/window-tree.c b/window-tree.c
index 488a2e6d..2cbb18a7 100644
--- a/window-tree.c
+++ b/window-tree.c
@@ -422,8 +422,6 @@ window_tree_draw_session(struct session *s, struct screen_write_ctx *ctx,
 	char			*label;
 	size_t			 len;
 
-	if (sx == 0)
-		return;
 	total = winlink_count(&s->windows);
 
 	memcpy(&gc, &grid_default_cell, sizeof gc);
@@ -544,8 +542,6 @@ window_tree_draw_window(struct session *s, struct window *w,
 	char			*label;
 	size_t			 len;
 
-	if (sx == 0)
-		return;
 	total = window_count_panes(w);
 
 	memcpy(&gc, &grid_default_cell, sizeof gc);