Gna bug 25341 ) https://web.archive.org/web/20170307145324/http://gna.org/bugs/?25341 ) removed QWheelEvent::source() from use because all branches back then had only Qt-5.2 as the minimum version, and QWheelEvent::source() is added in Qt-5.5.
Check if it would be needed now that latest branches have higher Qt minimum requirement.
Gna bug 25341 ) https://web.archive.org/web/20170307145324/http://gna.org/bugs/?25341 ) removed QWheelEvent::source() from use because all branches back then had only Qt-5.2 as the minimum version, and QWheelEvent::source() is added in Qt-5.5. Check if it would be needed now that latest branches have higher Qt minimum requirement.
Similarly gna bug 25344 ( https://web.archive.org/web/20170307145103/http://gna.org/bugs/?25344 ) removed QWheelEvent::phase() use from the very same contexts for the same reason.