Bug when the two thumbs are in the same value

[victorraft]

In version 1.4.0 when you overlap the two thumbs settling them in the same value you can't select a higher value anymore, just a lower one.

Steps to reproduce:

• Create a slider with values from 1 to 5, for example.
• Drag both sliders to occupy the same value, like 3.
• Try to drag one of the sliders to a higher value, like 4.
• Slider will not move.