Middle click copy/paste does not work on App Designer

Using Ubuntu, I am used to copy/paste text with the mouse's middle click.

While it works in the Matlab's editor, the middle click does nothing in the "Code View" of the App Designer.

Is anyone experiencing that? Does anyone have a workaround? I know I can copy/paste in other ways but it's hard to change such an old habit!

Thanks in advance!

[Aurelien Delphin]

I also noticed that the emacs shortcuts are not applied to the App Designer. Same problem, I know other shortcuts but, habits...