[plasmashell] [Bug 415130] Lock and login screens: entering incorrect password or moving focus away breaks using return/enter key to submit password

[Harald Sitter]

https://bugs.kde.org/show_bug.cgi?id=415130

--- Comment #32 from Harald Sitter <sitter at kde.org> ---
Something in qtvirtualkeyboard meddles with the active focus, quite possibly
via a timer, that's just a guess though because I saw some timers causing
QQuickWindowPrivate::setFocusInScope calls. 

> sudo rm /usr/lib/x86_64-linux-gnu/qt5/plugins/platforminputcontexts/libqtvirtualkeyboardplugin.so

temporarily bricks QVKB and in turn unbreaks the focus management. So, the
culprit is definitely there, question is just where exactly. There seems to be
a whole bunch of indiscriminate focus and keyboard hijacking going on inside
platforminputcontext.cpp at least.

Lastly, seeing as all reports continue to be neon-derived one has to wonder if
a patch is the cause or if other distributions just don't package QVKB plugins
to the extend we'd need for a working integration. At a glance I didn't find a
patch causing it in QVKB at least, still could be anywhere else between there,
qquick,declarative,gui and core though :S
It'd be good if someone could actually verify if QVKB on other distros works to
the expected extended and if that still has working focus management. If that
is the case then it almost must be a patch that's the root cause.

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