Pull request

Description

When sliding on a PillarboxSlider outside of its bounds, the display value may be negative, or bigger than the media duration.
This PR changes that by making sure that the gesture horizontal offset is in [0, sliderWidth].

Changes made

• Self-explanatory.

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.