Shift-select is "sticky"

[avclubvids]

The shift-select box starts drawing when you press the shift key instead of when you click the mouse (a more normal/expected shift-select behavior) so you have to either re-draw your selection if it started drawing in a strange place, or you end up making several smaller-than-intended shift-select actions to get all the points you're aiming for.

[clementjambon]

Hello @avclubvids I refer you to the answer to this other issue: #4