Composing HTML with inline images with non-ASCII character names

[asctime]

HTML-message-Inserting an image like:

DJ_Roüge.jpg

Will fail because when g_filename_to_uri does its job, the URI escape character "%" gets applied to the CID. Strictly speaking, this is correct behaviour per RFC 3986. But that's moot, as '%' is a highly illegal Windows character that blocks the filename from ever embedding in the first place. Also, I am unable to find any HTML-capable email client having issues with un-escaped names for images. I am therefore undoing the URI escaping of non-ascii image names for Windows and sending them as-is. Ideal solutions would be a complete wide-character re-write of EV2W and GTK3 ha ha, but this is at least a clean and explicit way of dealing with the issue. 631a168