Yuxuan Shui 7c1876c787
core: don't use stale window images ...
Previously, when the backend doesn't implement root_change(), we will
deinit, and then init the backend again. However, we didn't free all the
images previously returned by the backend. There is no guarantee that
these images will be valid across deinit/init.
So, make sure they are freed.
Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com >
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