qtwebengine ignores xkb settings.

USE flags for dev-qt/qtwebengine-5.13.2:
+ alsa          : Add support for media-libs/alsa-lib (Advanced Linux Sound Architecture)
- bindist       : Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)
- debug         : Enable extra debug codepaths
- designer      : Install the QWebEngineView plugin used to add widgets in dev-qt/designer forms that display web pages.
- jumbo-build   : Combine source files to speed up build process.
- pulseaudio    : Add support for PulseAudio sound server
+ system-ffmpeg : Use the system-wide media-video/ffmpeg instead of bundled.
+ system-icu    : Use the system-wide dev-libs/icu instead of bundled.
- test          : Enable dependencies and/or preparations necessary to run tests
+ widgets       : Enable QtWidgets support

dev-qt/linguist-tools-5.13.2
dev-qt/qtchooser-66
dev-qt/qtconcurrent-5.13.2
dev-qt/qtcore-5.13.2-r2
dev-qt/qtdbus-5.13.2
dev-qt/qtdeclarative-5.13.2-r1
dev-qt/qtgui-5.13.2
dev-qt/qtimageformats-5.13.2
dev-qt/qtmultimedia-5.13.2-r1
dev-qt/qtnetwork-5.13.2
dev-qt/qtopengl-5.13.2
dev-qt/qtpositioning-5.13.2
dev-qt/qtprintsupport-5.13.2
dev-qt/qtquickcontrols-5.13.2
dev-qt/qtscript-5.13.2
dev-qt/qtsql-5.13.2
dev-qt/qtsvg-5.13.2
dev-qt/qttest-5.13.2
dev-qt/qtwebchannel-5.13.2
dev-qt/qtwebengine-5.13.2
dev-qt/qtwebkit-5.212.0_pre20190629
dev-qt/qtwidgets-5.13.2
dev-qt/qtx11extras-5.13.2
dev-qt/qtxml-5.13.2
dev-qt/qtxmlpatterns-5.13.2

> setxkbmap -query
rules: evdev
model: pc104
layout: us
options: altwin:menu_win