Issue #2717921 by gaurav.kapoor, drnikki, subhashuyadav, pratik_specbee,...

Issue #2717921 by gaurav.kapoor, drnikki, subhashuyadav, pratik_specbee, hmendes, jhodgdon, joachim, effulgentsia, shashikant_chauhan, Wim Leers, larowlan: undocumented #has_garbage_value property of render elements

(cherry picked from commit d909b20df7dc99e432bf9815bc7f280d4d35716f)