Make the input panels for Facet$draw_panesl
predicatable
#6407
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fix #6406
This PR just make sure the
panels
input forFacet$draw_panel
follows the shape:It'll be a list of gTree object for each panel: each gTree object contains 3 children for Coord$render_fg, Coord$render_bg and another gTree of Facet$draw_back, all layer grobs, and Facet$draw_front