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This is not strictly the fault of wysiwyg_imageupload - yet it is down to the the way that wysiwyg_imageupload does what it does.
Nice valid xhtml-strict source
<img src="image.jpg" alt="an image" />
<img src="image.jpg" alt="an image">
whenever "Image Uploading" is enabled for the WYSIWYG format.
This is for "normal" image embeds, not the actual wysiwyg_imageupload additions, and also applies to a few other trivial source-code cases.
This is a problem for me as
A: the rest of the site and theme used to validate perfectly. Now it can't.
B: I am using another input filter that does clever things using xpath processing on what used to be valid XHTML.
I spent like 6 hours on this today, first tracking it down to here, then tracing it and trying and failing to find work-arounds.
It's all about how tinymce-3.js chooses to use jquery on the attach and detach callbacks.
For reasons I've now researched until my eyes bleed,
- tinymce proper does not use jquery, and does a fine job of maintaining markup validity.
- wysiwyg_imageupload uses jquery to do a little pre and post processing of the text whenever the text editor is enabled.
- jquery, specifically the $content.html() call, doesn't give a damn about the validity or DOCTYPE and always returns old-style HTML (no closing singleton slash), not XHTML.
Stand-alone WYSIWYG.module + TinyMCE is fine, but wysiwyg_imageupload calls jquery to read, parse, manipulate and write-out the text content. In the process, that corrupts it.
I have totally failed to find a way to sensibly prevent this from happening, or to get jquery to return better markup.
I searched a LOT, and am not proposing any solution, I just need to document it here that this should rate as a "Known issue"
If any genius can solve this well, I'd like to see it.
* I don't want to discard the current, sensible jquery utility calls totally. But it looks like that's what it would take.
* I don't like the idea of a regexp repair-job after-the-fact. That's just horrid.
* I tried working around the issue to pretend it should not happen when the attach/detach processes actually have nothing to do. But that just becomes unstable.
For my actual use-case, I'm going to give up and get my XHTML parser to re-tidy the bad input before processing, as that's the most robust way to protect myself against invalid stuff.