Describe the bug
At least for me, when I have the "Downsample when panning" selected in the volume viewer, the downsampling doesn't stop when I stop panning (e.g. when I release my mouse button). The downsampling only stops when I change focus to something else in the application.

To Reproduce

• Open a volume viewer
• Select "Downsample when panning" in the viewer state options
• Pan the view using the mouse

Expected behavior
Downsampling should stop when I release the mouse button

Screenshots
https://github.com/user-attachments/assets/e6cfc8ab-bdbe-4d27-8493-206ee4c5f353

Details:

• Operating System: Ubuntu 22.04 (also happens on my M3 MacBook)
• Python version (python --version): Python 3.11.6
• Glue version (glue --version): 1.21.1
• How you installed glue: pip

Additional context
I haven't gotten a chance yet to investigate this at all, so I have no idea at what layer (this package, Qt, etc.) the problem is