From b1653cd361aa2acd632877829c6d55a859e39d20 Mon Sep 17 00:00:00 2001
From: omar <omarcornut@gmail.com>
Date: Thu, 9 Nov 2017 20:09:09 +0100
Subject: [PATCH] Drag and Drop: Allow NULL payload (since type only can be
 useful). (#143)

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

diff --git a/imgui.cpp b/imgui.cpp
index a5e9d37a..2ead2edf 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -10742,7 +10742,7 @@ bool ImGui::SetDragDropPayload(const char* type, const void* data, size_t data_s
 
     IM_ASSERT(type != NULL);
     IM_ASSERT(strlen(type) < IM_ARRAYSIZE(payload.DataType));       // Payload type can be at most 8 characters longs
-    IM_ASSERT(data != NULL && data_size > 0);
+    IM_ASSERT((data != NULL && data_size > 0) || (data == NULL && data_size == 0));
     IM_ASSERT(cond == ImGuiCond_Always || cond == ImGuiCond_Once);
     IM_ASSERT(payload.SourceId != 0);                               // Not called between BeginDragDropSource() and EndDragDropSource()