This function converts a gtable, as produced by ggplot2::ggplotGrob() and
makes it ready to be added to a patchwork assemble. In contrast to passing
the gtable to wrap_elements(), wrap_ggplot_grob() ensures proper
alignment as expected. On the other hand major restructuring of the gtable
will result in an object that doesn't work properly with
wrap_ggplot_grob().
wrap_ggplot_grob(x)A gtable as produced by ggplot2::ggplotGrob()
A table_cell object to be added to a patchwork assemble