Snap Interaction

[DiffPetrovich]

Is your feature request related to a problem? Please describe.
Please make snapping/sticking feature, e.g. when we draw new line/point, it can be attached exactly to an existing one, just like in any CAD system or OSM data editor. Umap very lacks this.

Describe the solution you'd like
One of these:

1. While drawing a line/point, when the mouse is near an existing one, the latter is highlighted. When we click during this highlight, the new point is creating at the nearest position from the mouse exactly on top of the highlighted one (CADs usually use this approach).
2. While drawing a line/point, when the mouse is near an existing one, the point instantly sticks to it and we can adjust the position and click the mouse to create (see example below).

Also the snapping should be when a line ends on itself.

Describe alternatives you've considered
None. I import some OSM data and want to draw manually on top of that, connecting points/lines, but the precise mapping with this soft is impossible since new geometry's points are created at some distance from the existing vector's axis/center and this distors the final map.

Additional context
You can see the example here: https://openlayers.org/en/latest/examples/snap.html
(I understand, that you use Leaflet and this may be its problem, but decided to put the issue here, the final product, for more people to know about it).