Slider: Keyboard navigation is broken when in range mode

[lriecken]

Describe the bug

If the slider is in range mode, the incrementValue and decrementValue functions do not get the index of the model value to update. Thus, the model value gets set to NaN if the user tries to change the range slider with the arrow keys.

Reproducer

No response

PrimeVue version

3.15.0

Vue version

3.x

Language

ALL

Build / Runtime

TypeScript

Browser(s)

No response

Steps to reproduce the behavior

1. Create a slider and set the attribute range to true.
2. Tab until you have the first slider handle selected.
3. Use the arrow keys to change the value.
4. The model value gets set to NaN.

Expected behavior

The model value should be incremented or decremented.