Timeline panning bug fix

[antares1470]

Description of the Change

Added a fix for the bug in the timeline view where the box in the summary window would shrink when panning the timeline past the bounds of the of the summary window.

Alternate Designs

Why Should This Be In Core?

Fix for a bug in a feature of Core

Benefits

Possible Drawbacks

Verification Process

1. Open a new graph and create a sphere graph
2. Open timeline view ensuring that summary window is visible
3. Pan timeline across and observe box in summary view doesn't change its size when going past summary window bounds
4. Verify that the expected ways to change the size of the box (e.g. zooming) still behave as expected

Applicable Issues

#498

[sonarqubecloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

0.0% Coverage
0.0% Duplication

[arcturus2]

I think I was able to get the window to shrink trying to drag it beyond the end of the timeline but when I tried to gif it, it wouldn't happen again (so I guess it never happened 😄). It is very hard to break it now so approving this too.