/usr/share/glib-2.0/schemas/org.gnome.evolution.plugin.prefer-plain.gschema.xml is in evolution-common 3.12.9~git20141130.241663-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <?xml version="1.0" encoding="UTF-8"?>
<schemalist>
<schema path="/org/gnome/evolution/plugin/prefer-plain/" id="org.gnome.evolution.plugin.prefer-plain" gettext-domain="evolution">
<key type="s" name="mode">
<default>'normal'</default>
<summary>Mode to use when displaying mails</summary>
<description>The mode to use for displaying mails. "normal" makes Evolution choose the best part to show, "prefer_plain" makes it use the text part, if present, and "only_plain" forces Evolution to only show plain text</description>
</key>
<key type="b" name="show-suppressed">
<default>true</default>
<summary>Whether to show suppressed HTML output</summary>
<description>Whether to show suppressed HTML output</description>
</key>
</schema>
</schemalist>
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