The Krita code that deals with tablet events seems to be this in
kis_canvas_controller.cpp:
-----
void KisCanvasController::Private::emitPointerPositionChangedSignals(QEvent
*event)
{
if (!coordinatesConverter) return;
QPoint pointerPos;
QMouseEvent *mouseEvent = dynamic_cast<QMouseEvent*>(event);
if (mouseEvent) {
pointerPos = mouseEvent->pos();
} else {
QTabletEvent *tabletEvent = dynamic_cast<QTabletEvent*>(event);
if (tabletEvent) {
pointerPos = tabletEvent->pos();
}
}
----
The obvious failure point being that if the argument is neither a mouse
nor a tablet event, then pointerPos is uninitialized. I did not have
time to check yet whether the bug is caused by this or something else
entirely.
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https://bugs.launchpad.net/bugs/799202
Title:
wacom stylus jumps with latest xserver-xorg-core
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