Discover panels via gtable layout rows named '^panel-<num>' or '^panel-<row>-<col>' Returns a data.frame with panel_index, name, t, l, row, col
Source:R/ggplot2_patchwork_utils.R
find_patchwork_panels.RdDiscover panels via gtable layout rows named '^panel-<num>' or '^panel-<row>-<col>' Returns a data.frame with panel_index, name, t, l, row, col