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backing drawable if the serial numbers differ. Fixes crash in XAA which
occurred when the DDX bumped the serial number on the backing drawable and
expected it to get re-validated, and we didn't because the wrapped drawable
hadn't been bumped.
(cherry picked from
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| .. | ||
| cw.c | ||
| cw.h | ||
| cw_ops.c | ||
| cw_render.c | ||
| Makefile.am | ||