MuseScore does not support the notation of two notes at the same pitch within a chromatic aggregate.
The solution of shifting to the right does not work with additional lines (the line is extended).
One time consuming solution would be to write the right A within a second voice and hide unwanted stems or rests, but this will not resolve the second problem;
In addition, the added line or glissando cannot be grouped solidly to the two elements it connects; changing the number of measures per system, for example, destroys the layout and the efforts to compensate for this missing functionality.
Does anyone have a solution?
When will this be implemented by default?
Thank you !
Sorry for the translation.