[kmail2] [Bug 399245] Restore UI functionality related to "Show HTML side bar"

[Christophe Giboudeaux]

https://bugs.kde.org/show_bug.cgi?id=399245

--- Comment #13 from Christophe Giboudeaux <christo...@krop.fr> ---
See https://phabricator.kde.org/M155 for the first mockups

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