bug#32795: Acknowledgement (26.1; provided-mode-derived-p does not support parent modes set with defalias)

[Andrew Schwartzmeyer]

Patch with tests attached. Please let me know if I missed anything, or 
if the code could be improved. I read through CONTRIBUTE and may have 
accidentally sent this patch in as a new bug report, sorry!

This was generated from 'emacs-26' where the bug occurs, and will merge 
just fine into 'master'. The bug also exists on 'emacs-25' but the code 
is slightly different ('provided-mode-derived-p' had not been extracted 
yet from 'derived-mode-p'). I can supply a back-ported patch as well.

Thanks,

Andy

On 09/21/2018 8:22 am, help-debbugs@gnu.org wrote:
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0001-Fix-provided-mode-derived-p-when-the-parent-is-an-al.patch
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