The change-value signal is emitted when a scroll
action is performed on a range. It allows an application to determine
the type of scroll event that occurred and the resultant new value.
The application can handle the event itself and return
true to prevent further processing. Or, by returning
false, it can pass the event to other handlers until
the default GTK+ handler is reached.
The value parameter is unrounded. An application that overrides the
change-value signal is responsible for clamping the
value to the desired number of decimal digits; the default GTK+ handler
clamps the value based on
It is not possible to use delayed update policies in an overridden
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