workaround 'fig.dim' default option serialized as list (closes #3450)
workaround 'fig.dim' default option serialized as list (closes #3450)

JanMarvin/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,JanMarvin/rstudio,JanMarvin/rstudio