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Do not snapshot session when idle

Benoît DÉCHAMPS requested to merge dura/konsole:reduce_idle_cpu_io_usage into master

Despite bug 325442 marked as fixed konsole is still accessing regularly to /etc/passwd and /proc when totally idle (observed with konsole 21.12.3). This is an attempt to really fix it.

There is no reason for a tab title to change if there is no QT event. So, instead of snapshoting session regularly, we do it only if there is some QT events. To catch all QT events an event handler is installed on the QCoreApplication instance.

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