kcms/nightcolor: hide preview message after scroll manipulation
requested to merge ngraham/plasma-workspace:hide-preview-message-after-scroll-manipulation into master
Currently, if you interact with one of the color temperature sliders
by scrolling, the preview message and full-screen color tint are
activated but never deactivated. This is because the deactivation only
happens in an onPressedChanged handler, but with a scroll, there is no
change to the pressed property's status, so it never fires and hence
the message and overlay never disappear.
This commit fixes that by using a timer to hide them that only triggers when a slider is manipulated using a scroll.
BUG: 458675 FIXED-IN: 5.26