To reproduce:
1) Create a new project
2) Go to "Help -> About Unity"
3) Type in "internal" to get the dots in the upper left corner of windows showing if they're being repainted
4) Try selecting each object, but keep the mouse in hierarchy view

Expected: Scene view only gets redrawn once as new gizmos/outline appear

5) Add a particle system to one of the objects
6) Stop it

Actual: While Particle System Inspector is still visible, it keeps redrawing scene view window, even if particle rendering is stopped

Reproduced in 2018.1.0f1, 2018.2.10f1, 2019.1.0a4