'is_handle_to_right_extreme' never true with single handle.

[cjshaw1976]

I would like to set up a single handle slider, range between 0 and 1000. When range = 1000, I would like the method 'is_handle_to_right_extreme' to return true when the handle reaches 1000, but currently, it does not. The 'is_handle_to_left_extreme' does return true when the handle is on the left (0).

[darksmo]

According to the documentation for the method this method is called when the right handle is all the way to the right. With one handle you only have the left handle basically...