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Use styleHint to enable opening an item on single click

Fushan Wen requested to merge work/fusionfuture/BUG443858-real-always-single-click-open-item into master

Connecting both clicked and activated signals causes unnecessary reloading of KCMs when clicking files or folders is set to open them, and will crash systemsettings when opening Powerdevil settings. (powerdevil!75 (merged))

This commit uses QProxyStyle to set style hint in CategorizedView. QStyle::SH_ItemView_ActivateItemOnSingleClick now always returns 1 regardless of the behavior settings, so an item will always be opened on single click.

CCBUG: 443858

Edited by Fushan Wen

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