When using arrow keys to navigate Sprite frames, scroll to keep active frame in view

[lkcampbell]

Describe the bug
When you have a large enough number of Sprite frames in the bottom Frames view, the view provides a horizontal scroll bar and the excess frames are moved off the left or right side of the screen. One way to navigate these frames quickly are the left and right arrow keys. When you navigate to a frame that is outside of the frames view, the view does not scroll to show the current frame.

To Reproduce
Steps to reproduce the behavior:

1. Make an animation in Sprites that has enough frames that the horizontal scroll appears, say, 10-20.
2. Select a frame as your current frame and use the arrow keys to navigate to a frame outside the left and/or right edge of the horizontal scrolling view.

Observed behavior

Before hitting left arrow:

After hitting left arrow:

Expected behavior

Before hitting left arrow:

After hitting left arrow:

Platform (please complete the following information):

• OS: macOS 14.6.1 (23G93)
• App version 4.0.2