Issue Summary

There's some issues with the sound frame visualization:

• When I select the frames in a sound layer, the selected frames will be visualized with an offset all the way to the left of its container.
• This is happening ever since the sound frame-add preview feature was added. When you double click an empty space you will add a new frame
• It seems only the first frame container is used as the previsualization model for new frames. In this case I think it's sensible given the variety of sound lengths one can have, but I just want to know if it's intended or not. Please confirm.
• Considering audio files will always force a container to change size it might be better to make it a fixed size of one frame 🟥 instead but I'll make this a separate request after we have discussed it internally with the team.

Video or Image Reference

Unselected Frame

Selected frame
Notice how the frame container shifts towards the left; If I grab the sound in any place that it should exist, I can drag it properly, so it's just a visual glitch when selected

Expected Results

Frame container previsualization should accurately depict the position and length of the sound frame or any other frame in any layer.

Steps to reproduce

1. Add a sound layer
2. Add a sound file
3. Observe the correct position of the frame container
4. Select the the frame container
5. Notice the offset towards the left of its starting point

System Information

• Pencil2D Version:
  Nightly Build Nov 14 2021

commit: 91b1721
date: 2021-11-14_16:46:59

Operating System: Windows 10 Version 2009
CPU Architecture: x86_64
Qt Version: 5.15.2