ScrollBar: Fix pixel alignment in RTL mode
PenWidth::Frame is a floating number, intentionally set to something non-integer. So it needs to round up or down as appropriate instead of throwing it at default truncating strategy.
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(The other, second pixel mis-alignment is due to be fixed in System Settings and Kirigami/ColumnView)
ToolButton: Fix drop-down menu arrow in RTL layouts
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CCMAIL @jblackquill