@thibautsailly concerning the last AC, how should we proceed ?

1. Disable the "Hide this waypoint" option
2. Hide it
3. Leave it normal but doesn't fire any action when clicking on it
4. Leave it normal but displays a warning somewhere when clicking on it

Very very specific but because the options here are disabled, clicking on them do not close the window, it doesn nothing, but clikcing in the yellow zone works to close th window. Idk if it's easy to fix that, it's minor anyways.

The contextual menu item should be disabled with a title tag explaining that we need at least two OP to project the graph.
Later, we'll use a dedicated tooltip to display the message as soon as the user hovers the item, which will be very useful in other situations.

Very very specific but because the options here are disabled, clicking on them do not close the window, it doesn nothing, but clikcing in the yellow zone works to close th window. Idk if it's easy to fix that, it's minor anyways.

We can discuss this, but to me it seems licking anywhere in the browser window should close this contextual menu.