[kmail2] [Bug 367598] New: Kmail needs to force platform xcb on Linux

[Martin Gräßlin via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=367598

            Bug ID: 367598
           Summary: Kmail needs to force platform xcb on Linux
           Product: kmail2
           Version: Git (master)
          Platform: Compiled Sources
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: mgraesslin at kde.org

Due to Qt-Bug https://bugreports.qt.io/browse/QTBUG-55384 KMail crashes on
startup on Wayland. If one specifies "--platform xcb" manually kmail starts and
is usable.

As we cannot expect users to know that KMail cannot be used on Wayland, we
should make kmail default to xcb.

Reproducible: Always

Steps to Reproduce:
1. Run Plasma Wayland session
2. Try to start kmail

Actual Results:  
KMail crashes

Expected Results:  
KMail does not crash

The easiest way to work around the Qt bug is to put a:
qputenv("QT_QPA_PLATFORM", "xcb");

before creating the QGuiApplication. This should of course only be done when
running on Linux. An example how to do this is in KWin
https://quickgit.kde.org/?p=kwin.git&a=blob&h=e4db348bf6dc01b431257e88129a8d7ea14ff92e&hb=a67ccc3529326e6ee8a615ede312aea3b33e844a&f=main_x11.cpp
(line 404)

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