Correct the deferred seek

[waliid]

Description

Self-explanatory.

Changes made

• Avoid pausing playback when seeking in deferred mode.
• Avoid hiding playback controls when the user interacts with the slider in deferred mode.

Checklist

• 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).
• The playground has been updated (if relevant).