Create a new warning message. The message will make copies of @error and @debug.
The object originating the message.
The GError for this message.
A debugging string.
(allow-none): A GstStructure with details
Return: the new warning message.
ConstructionException GTK+ fails to create the object.
1.10
See Implementation
Create a new warning message. The message will make copies of @error and @debug.