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QDBusMenuConnection: Close open D-Bus connection

Andreas Sturmlechner requested to merge asturmlechner/qtbase:QTBUG-94839 into kde/5.15

Using QSystemTrayIcon::isSystemTrayAvailable() generates a new connection from QDBusTrayIcon::isSystemTrayAvailable() with a new unique instance ID. These were never closed, so calling QSystemTrayIcon::isSystemTrayAvailable() frequently leads to crash when it runs out of file descriptors.

Fixes: QTBUG-94839 Pick-to: 5.15 6.1 6.2 Change-Id: Ib71441a6b680d8633707cc02f9b6081c0f02472b Reviewed-by: Dmitry Shachnev mitya57@gmail.com Reviewed-by: Shawn Rutledge shawn.rutledge@qt.io (cherry picked from commit 2ca19d2d)

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