Mouse doesn't update immediately when switching to the color picker tool

[NinthDesertDude]

The cursor icon flickers to the color picker icon and back; it looks like a one-frame flicker. Once the mouse is moved, the icon is correct.

I suspect that the caues of the flicker is some value that contains the current cursor which gets overridden by the change made on the next evaluation (span of one draw + update cycle), but this value gets updated when the mouse is moved.