/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/ is in plasma-widgets-addons 4:5.8.5-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/config/
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/config/config.qml
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/config/main.xml
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/ui/
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/ui/PasteMenuItem.qml
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/ui/ShareDialog.qml
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/ui/ShowUrlDialog.qml
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/ui/main.qml
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/contents/ui/settingsGeneral.qml
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/metadata.desktop
/usr/share/plasma/plasmoids/org.kde.plasma.quickshare/metadata.json