bug#40247: 27.0.90; mailcap-mime-data erased when parsing mime parts
- Start Emacs in a system without ~/.mailcap
- Launch Gnus
- Open an email / news that has some part in text/html
- mailcap-mime-data is erased and none of the default viewers are
available any more.
The problem persits if Emacs is customized using mailcap-add
This bug breaks systems that do not rely on .mailcap for defining
external viewers. In particular, it breaks systems that require
pdf-tools or doc-view to view certain attachments. It also deletes
Emacs' traditional association list betwee mime types and actions.
In GNU Emacs 27.0.90 (build 5, x86_64-w64-mingw32)
of 2020-03-25 built on DESKTOP-3A8AAJ0
Repository revision: 4860530f3c130c6f854ea83dcc03f59e535a33ba
Repository branch: emacs-27
Windowing system distributor 'Microsoft Corp.', version 10.0.18363
System Description: Microsoft Windows 10 Pro for Workstations (v10.0.1909.18363.720)
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value of $LANG: ESN
Major mode: Help
Minor modes in effect: