[kmail2] [Bug 385163] New: email rendering does not respect system font DPI settings

[Diggory Hardy]

https://bugs.kde.org/show_bug.cgi?id=385163

            Bug ID: 385163
           Summary: email rendering does not respect system font DPI
                    settings
           Product: kmail2
           Version: 5.4.3
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: kde at dhardy.name
  Target Milestone: ---

I'm using a high-DPI screen. In System Settings → Fonts, I set "Force fonts
DPI" to a larger value (currently 192), and most application text gets
increased in size. Not so with emails rendered in KMail2 (I can open the email
and zoom with Ctrl+WheelUp, but it's not automatic).

FYI Konqueror seems to have the same problem. So does Firefox, but it has its
own workarounds (and it's not KDE software).

I found two maybe-related bug reports; both about print size:
https://bugs.kde.org/show_bug.cgi?id=372662
https://bugs.kde.org/show_bug.cgi?id=78264

Alternatively I guess it would be okay to scale email rendering by the screen
DPI, not by the "force font DPI" setting.

As a workaround, setting the env var QT_SCALE_FACTOR=2 would "work" — but it's
an ugly hack which doubles the size of everything, including the useless
margins and all the UI elements which have already been increased in size
(through System Settings → Icons, Application Style, "force font DPI", and
possibly more); i.e. to use it effectively I'd have to set it desktop-wide at
startup and revert all the other tweaks, then put up with huge margins in all
the UIs.

Summary: automatically scale email rendering by "force font DPI" / default=96,
or by screen DPI

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