Loading Animation stops while loading the contents of large folders

## What Happened
Loading Animation stops while loading the contents of large folders.

## Expected Behavior
Loading Animation should continue animating while loading the contents of large folders.

## Steps to Reproduce
1. Set Files to view icons as grid.
2. Open a large folder known to take awhile to load (e.g., folder with 5000+ photos, perhaps more). This may depend on the speed of the computer used to replicate this issue.
3. Look at the spinning loading animation while the folder contents attempt to load.
4. Animation will stop only after a few seconds which may lead the user to believe that Files has become unresponsive or has crashed. However, it is still loading. If left alone, the folder and thumbnails will successfully load after several seconds or minutes.

### Logs

## Platform Information

OS: elementary OS 6 Odin x86_64
Kernel: 5.11.0-27-generic
Packages: 1699 (dpkg), 20 (flatpak)
Shell: bash 5.0.17
Resolution: 3840x2160
DE: Pantheon
WM: Mutter(Gala)
Theme: io.elementary.stylesheet.blueberry [GTK3]
Icons: elementary [GTK3]
Terminal: io.elementary.t
CPU: Intel Xeon W3680 (12) @ 3.326GHz
GPU: NVIDIA GeForce GT 1030
Memory: 1370MiB / 24047MiB