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plugins/screenshot: Cache screenshot attributes

Vlad Zahorodnii requested to merge work/cherry-pick-69f344a4 into Plasma/6.0

When a QPromise reports results, it's not necessary that the QFutureWatcher is going to report it immediately. That can happen at some point in the future, which is okay according to the QFuture api contract.

Due to that, we cannot assume that the stored Output and EffectWindow objects pointers are valid when the QFutureWatcher::finished is emitted.

(cherry picked from commit 69f344a4)

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