I don't think it's a bug. It's a snippet from the official documentation.Look at the first snippet in the following page, there's a collision as well: LilyPond Learning Manual: 4.6.3 Real music example
| | | | LilyPond Learning Manual: 4.6.3 Real music example LilyPond Learning Manual: 4.6.3 Real music example | | | A function that helps in discovering these things would be really useful... Il venerdì 15 novembre 2019, 11:01:14 CET, Malte Meyn <lilyp...@maltemeyn.de> ha scritto: Am 15.11.19 um 01:50 schrieb Paolo Prete: > > I think that a very useful function would be a way to highlight or > change the color for all the objects that are causing a collision. > Is there already some code for that? > Look for example at the two slurs in the following snippet: > > […] > > When there are many and many graphic objects on a score, it's easy to > ignore some of these errors relying on observation only... If LilyPond knew that there was a collision it wouldn’t engrave it that way so IMO that’s a bug. Without knowing about a collision LilyPond cannot tell you about it ;)