[kmail2] [Bug 368843] New: kmail2 message view with qtwebengine hidpi is broken

[Bruno Friedmann via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=368843

            Bug ID: 368843
           Summary: kmail2 message view with qtwebengine hidpi is broken
           Product: kmail2
           Version: Git (master)
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: grave
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: bruno at ioda-net.ch

With hidpi 144 or more (I've 168 and 288 dpi screens) the display message
viewport is completely broken.

Seems kmail2 code doesn't apply this simple fix
https://bugreports.qt.io/browse/QTBUG-54114



Mention High-DPI on WebEngine documentation, and recommend to set

QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling)

before creating Q*Application.

THis is actually recommended for all applications (see
http://doc.qt.io/qt-5/highdpi.html). For WebEngineView specifically, it makes
sure that the default scaling factor of pages is reasonable.


Reproducible: Always

Steps to Reproduce:
1. open kmail2 with qtwebengine on high dpi screen
2. cry :-)
3. loose your eyes :-))


Actual Results:  
Wrong scale (dpi and scale factor) in message list
So click on link is no more feasible, copy and paste is completely wrong etc.
can't activate click to read pure html message and so on.

Expected Results:  
Wrong on hipdi as well on normal 96dpi

Screenshot coming

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