Revert of core.renderer.action_button
Revert of core.renderer.action_button


lino-framework/lino,lsaffre/lino,lsaffre/lino,lino-framework/lino,lino-framework/lino,khchine5/lino,lsaffre/lino,khchine5/lino,lino-framework/lino,khchine5/lino,khchine5/lino,khchine5/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino