AB loop markers are not shown on seek bar

[famichiki]

Overview Description: AB loop markers are not shown on seek bar timeline, there is no way to visually tell if or where a loop is set.

Steps to Reproduce:

1. Open an audio file
2. Seek to where you want to set an AB loop start or end point
3. Press "L" to create the point

Actual Results: No visible marker is created on the seek bar.

Expected Results: AB loop start and end points should be indicated on the seek bar.

Version: 0.24

Additional Information: