Right-aligned popups are one pixel away from right edge of the screen and top-aligned popups (when the panel is on top) are one pixel inside panel. This is because the bug in QRect, where right() and bottom() value return value that is less than the true value by one. This is a feature-bug that Qt developers aren't going to fix because of compatiability reasons. My patch replaces rect.right() and rect.bottom() with (rect.x() + rect.width()) and (rect.y() + rect.height()) respectively.

Works as expected.