browse-url-of-buffer broken at HEAD?

[T.V Raman]

Simple Test Case:

1. Create  a new empty buffer  called "foo" and switch to it
2. Type this in that buffer:
<p>test</p>
3. M-x browse-url-of-buffer
where browse-url is set up to render using EWW
4. You dont get a rendered result, instead you see the HTML source,
and a message in the minibuffer re loading the HTML5 schema.
5. But if you now switch to *Messages* you see an error
"File exists but cannot be read".
6. /tmp does contain the generated file, and eww-open-file renders it
correctly.

Might be useful when debugging, if you  again try
browse-url-of-buffer, you dont see the error message above (but you
dont get the result rendered either)

Using debug-on-error did not help, it did not enter the debugger.

This error appears relatively new,



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