Main changes in this release:
● Added a new option for the view-item click behavior, following the current DE by default.
● Ignored the disabled state of tree expanders (because some apps, like Dolphin, don't enable them).
● Removed the Wayland menu translucency workaround for Qt ≥ 5.12.
● Fixes for combo menus that have stylesheet.
● A workaround for a Qt bug that causes drawing problems with non-integer scale factors.
● Avoid ugly backgrounds behind menu scrollers.
● A workaround for a serious problem caused by Qt 5.13.1 → QWidget::setAttribute()
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