Function previous_single_property_change

pub fn previous_single_property_change<'ob>(
    position: usize,
    prop: Gc<ObjectType<'ob>>,
    object: Gc<ObjectType<'ob>>,
    limit: Option<usize>,
    env: &'ob mut Rt<Env<'_>>,
    cx: &'ob Context<'_>,
) -> Result<Gc<ObjectType<'ob>>>

Return the position of next property change for a specific property. Scans characters forward from POSITION till it finds a change in the PROP property, then returns the position of the change. If the optional third argument OBJECT is a buffer (or nil, which means the current buffer), POSITION is a buffer position (integer or marker). If OBJECT is a string, POSITION is a 0-based index into it. The property values are compared with `eq’. Return nil if LIMIT is nil or omitted, and the property is constant all the way to the end of OBJECT; if the value is non-nil, it is a position greater than POSITION, never equal.

If the optional fourth argument LIMIT is non-nil, don’t search past position LIMIT; return LIMIT if nothing is found before LIMIT.