Re: Colored box behind a single note

[Werner LEMBERG]

Oops, some typos.  Here a corrected algorithm version.

Here's the algorithm.

For a given moment,

(1) count the number of \startGroup and \stopGroup events and push the
    events onto a stack so that they can be referenced later on
    (function `listen_note_grouping'),

(2) create a HorizontalBracket spanner for every \startGroup event and
    link it as necessary (function `process_music'),

(3) set one boundary for every element of the HorizontalBracket stack
    (function `acknowledge_note_column'),

(4) [my code addition] check whether there is a \stopGroup within a
    bunch of \startGroup's (or a single \startGroup within a bunch of
    \stopGroup's) and set the other boundary with the same values to
    create a single-moment horizontal bracket for this case (function
    `acknowledge_note_column'),

(5) pop an element off the HorizontalBracket stack for every
    \stopGroup event (function `stop_translation_timestep').


    Werner