Memory increase when exiting PIE with Project Settings open

Memory increase when exiting PIE with project settings open

Regression: YES

Broken: 3195953 (4.14.0)
Worked: 3195953 (4.13.2)

1. Open a template project (I used Third Person)
2. Open the Editor Preferences>Miscellaneous
3. Enable "Show Frame Rate and Memory"
4. Close Editor Preferences
5. Open Project settings and move the window to the side
6. Note the current memory usage
7. PIE
8. Note memory usage
9. Exit PIE
10. Repeat this a few times
11. Close Project settings and repeat

Result: Memory has increased by about 300mb each time you exit pie with Project Settings open
Expected: Same behavior with and without project settings open

Preferences windows cause memory leak and slowdowns in Editor