From e32569dd5aa008448b10d9be11e5193502f5368b Mon Sep 17 00:00:00 2001
From: omar <omarcornut@gmail.com>
Date: Sun, 15 Oct 2017 21:06:33 +0200
Subject: [PATCH] ImDrawList: Fixed a bug in ChannelsMerge() leading to an
 extraneous draw call being created, which unexpectly led to more dramatic
 condition but to faulty draw command merging code. (#1172, #1368)

---
 imgui_draw.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/imgui_draw.cpp b/imgui_draw.cpp
index f5923641..9da0ad1c 100644
--- a/imgui_draw.cpp
+++ b/imgui_draw.cpp
@@ -339,7 +339,7 @@ void ImDrawList::ChannelsMerge()
         if (int sz = ch.CmdBuffer.Size) { memcpy(cmd_write, ch.CmdBuffer.Data, sz * sizeof(ImDrawCmd)); cmd_write += sz; }
         if (int sz = ch.IdxBuffer.Size) { memcpy(_IdxWritePtr, ch.IdxBuffer.Data, sz * sizeof(ImDrawIdx)); _IdxWritePtr += sz; }
     }
-    AddDrawCmd();
+    UpdateClipRect(); // We call this instead of AddDrawCmd(), so that empty channels won't produce an extra draw call.
     _ChannelsCount = 1;
 }