High memory usage when the Sprite Editor window repaints on a sheet containing thousands of sprites

How to reproduce:

1. Open the attached "IN-147574" project
2. Open the "Spritesheet_test" asset (Assets/Resource/Font) through the Sprite Editor
3. Open the Profiler window and set the target dropdown to "Editor"
4. In the Profiler window, enable Record and note the "Total Used Memory" value
5. In the Sprite Editor, select any Sprite in the "Spritesheet_test" asset and drag it continuously for around 10 seconds
6. Observe the "Total Used Memory" value in the Profiler

Actual result: Memory usage grows continuously
Expected result: Memory usage remains stable

Reproducible with: 6000.0.0f1, 6000.0.82f1, 6000.3.23f1, 6000.5.10f1, 6000.6.0b10, 6000.7.0a5

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Notes:

• In 6000.6.0b10 and 6000.7.0a5 used memory is released upon reaching a certain threshold (during testing this was around 21 GB)
• A user reported the Editor crashing with ‘Could not allocate memory: System out of memory!’