Closes #2. I'm guessing from sway that the idea of setting maximized state so that windows cooperate is superseded by using set_tiled.
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wlr_xdg_toplevel_set_tiled(c->xdg_surface, 1);
wlr_xdg_toplevel_set_tiled(c->xdg_surface, WLR_EDGE_TOP | WLR_EDGE_BOTTOM | WLR_EDGE_LEFT | WLR_EDGE_RIGHT);
wlr_xdg_toplevel_set_tiled(c->xdg_surface, WLR_EDGE_TOP |
WLR_EDGE_BOTTOM | WLR_EDGE_LEFT | WLR_EDGE_RIGHT);