Windows 10, Intel HD Graphics 620
Broken: Blender 2.80 41cba97 ( Date 2018-05-17 02:04 )
Short description of error
Because of another bug ( https://developer.blender.org/T55205 ), I've noticed that the Eevee 3D viewport re-renders every frame where there is a mouse movement over the panel that contains the new icons ( Cursor / Select Border etc ). This happens in Object and Edit mode.
The refresh doesn't happen if you move the cursor over any of the other panels ( timeline etc ).
The refresh doesn't happen if the viewport is Cycles/Rendered. Seems to be Eevee rendered only.
Exact steps for others to reproduce the error
Move the mouse over the panel with the Cursor / Select border buttons, and have the viewport opened as Eevee / Rendered. It will refresh every frame where there is a mouse movement.