TreeNode: node with the ImGuiTreeNodeFlags_Leaf flag correctly disable highlight when DragDrop is active. (#143, #581)

imgui.cpp

@@ -6702,7 +6702,8 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
     // - OpenOnArrow .................... single-click on arrow to open
     // - OpenOnDoubleClick|OpenOnArrow .. single-click on arrow or double-click anywhere to open
     ImGuiButtonFlags button_flags = ImGuiButtonFlags_NoKeyModifiers | ((flags & ImGuiTreeNodeFlags_AllowItemOverlap) ? ImGuiButtonFlags_AllowItemOverlap : 0);
-    button_flags |= ImGuiButtonFlags_PressedOnDragDropHold;
+    if (!(flags & ImGuiTreeNodeFlags_Leaf))
+        button_flags |= ImGuiButtonFlags_PressedOnDragDropHold;
     if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
         button_flags |= ImGuiButtonFlags_PressedOnDoubleClick | ((flags & ImGuiTreeNodeFlags_OpenOnArrow) ? ImGuiButtonFlags_PressedOnClickRelease : 0);