SpinBox: Repair hovering, and improve RTL
SpinBox: Reformat QML for better code style and clarity
SpinBox: Let hover events propagate through TextField to the control
Otherwise, up/down indicators won't update their hovered states, and will be displayed incorrectly.
SpinBox: Reset activeSubControls when neither of indicators are active
Otherwise, an indicator remains in an active state even after being released and unhovered.
SpinBox: Remove assignment which is never read
There's a opt->subControls = QStyle::SC_All assignment below, which
makes sense, as we always want to draw every part of a SpinBox,
including up/down indicators.
SpinBox: Avoid explicit horizontalAlignment in TextField for better RTL
TextField is capable of detecting when it should use right alignment for RTL text, otherwise it is already left-aligned by default.
SpinBox: Flip left/right padding for styles with indicators on the sides
This is completely untestable with stock Breeze theme, but according to PlasmaComponents (e.g. in Panel's Edit Mode) and Qt's Basic QQC2 style the "down" indicator is supposed to be on the left and "up" is on the right.
Also, I tried hard to rewrite __lPadding/__rPadding bindings so they include actual gap between an indicator and control (i.e. control.width - up.indicator.x instead of simply up.indicator.width), but I just couldn't manage it without drowning in binding loops :-\