Fix all Qt 5.15 deprecation warnings#7783

Merged

droidmonkey merged 18 commits intokeepassxreboot:developfrom c4rlo:qt-modernize

Jun 22, 2024

+341-240

Commits on Jun 22, 2024

qSort() -> std::sort()

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rm QDateTime::toString(Qt::DefaultLocaleShortDate)

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rm QDateTime::toString(Qt::SystemLocaleShortDate)

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Use QDateTime::startOfDay()

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{QString->Qt}::SkipEmptyParts

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Don't call deprecated QFlags(nullptr) ctor

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QSet::{toList->values}

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Don't call deprecated QList::toSet, QSet::fromList

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QHash::insertMulti -> QMultiHash::insert

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QProcess::startDetached: non-deprecated overload

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QProcess::{pid->processId}

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QPainter::{HighQuality->}Antialiasing

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QPalette::{background->window}()

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Use Qt::{Background,Foreground}Role

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endl -> Qt::endl, flush -> Qt::flush

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Use QRecursiveMutex

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OpenSSHKeyGenDialog: fix use of deprecated setting

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Make YubiKey::s_interfaceMutex non-recursive

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