LilyPond Internals Reference: 2.2.19 Collision_engraver

### 2.2.19 Collision_engraver

Collect `NoteColumns`, and as soon as there are two or more, put them in a `NoteCollision` object.

This engraver creates the following layout object(s):

NoteCollision.

`Collision_engraver` is part of the following context(s): DrumStaff, GregorianTranscriptionStaff, KievanStaff, MensuralStaff, PetrucciStaff, Staff, TabStaff and VaticanaStaff.

#### Internals Reference v2.22.2 (stable-branch).