Debug message from KMail

Hello list,

Since my problems with "Serious problem with KMail" I've installed a new 
system, Gentoo, on bare silicon with ACCEPT_KEYWORDS="~amd64". In English, 
it's built using the testing versions of all packages. This was to get a more 
recent version of KMail. It's now 5.9.1 according to Help | About KMail.

I still can't get my local IMAP server recognised properly, but I ought to 
report a debug message that appeared on the Konsole I'd used to restart 
akonadi. It appeared after restarting KMail:

--------
Qt WebEngine seems to be initialized from a plugin. Please set 
Qt::AA_ShareOpenGLContexts using QCoreApplication::setAttribute before 
constructing QGuiApplication.
--------

I hope that helps someone.

-- 
Gentoo stable
sys-kernel/gentoo-sources 4.18.9
QT 5.11, KDE frameworks 5.50.0, KDE plasma 5.13.5
KMail 5.9.1 (gentoo 18.08.1), akonadi 18.08.1
x11-drivers/xf86-video-amdgpu 18.1.0, dev-libs/amdgpu-pro-opencl 18.20.606296