https://bugs.kde.org/show_bug.cgi?id=516951

--- Comment #1 from Dominique MICHEL <[email protected]> ---
I think i located the exact issue to be here : 
https://github.com/qt/qtbase/blob/11752e413ed762bc6e0cf8f903c0cb5204d0196b/src/gui/kernel/qcursor.cpp#L219

When the new cursor position goes over the border,
`screen->virtualSiblingAt(pos)` returns NULL, thus the
`QHighDpi::toNativePixels` function assumes a default scaling factor of 1 while
it should be (in the example) 2, thus only returning half the coordinates.

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