closedcaption/caption.c: fix deletion
Trying to write "" in order to erase characters in the caption frame simply fails silently, the proper way to implement delete_to_end_of_row and backspace was to memset the relevant cells.
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Trying to write "" in order to erase characters in the caption frame simply fails silently, the proper way to implement delete_to_end_of_row and backspace was to memset the relevant cells.