"Backporting" the QDesktopWidget::screenNumber(QWidget*) function from
qtbase HEAD helped for this particular problem. Packages with an extra
patch (debian/patches/multiscreen-MET.diff) are available on launchpad:
ppa:met-norway/updates-met

While the main problem is solved, the popups are still placed completely
on one screen even if the combobox spans two screens. This is maybe a
rather unusual window placement. Solving this probably requires changes
to QDesktopWidget (screen number from widget corner) and QComboBox
(popup placement such that it may span adjacent screens while still
being completely visible without gap) and maybe other popups (QMenu?).

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https://bugs.launchpad.net/bugs/1671853

Title:
  incorrect screen number reported by QDesktopWidget

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