Added a parbox to the marginnote command

[Timo-Weike]

Added a parbox to the marginnote command to address the problem described in this https://tex.stackexchange.com/q/511586/189822 stackexchange equestion

[astoeckel]

Thank you very much for your PR!

Unfortunately this breaks the correct alignment of marginpars with the main text for me. See attachment (left is without your PR, right with your PR).

[anastygnome]

Are you not looking for sidepar ?

[jangop]

Are you not looking for sidebar ?

Where is the text placed with \sidebar?

[anastygnome]

see my edit. One can also set a specific font. the problem is that the sidepar is floating but that's a plus as vspaces can be use with oneline skips :)