Bug 1979298 Comment 1 Edit History

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Looks like we also need to delay subsurface unmap until we have a new content as it's not synced:
```
Destroying a sub-surface takes effect immediately. If you need to synchronize the removal of a sub-surface to the parent surface update, unmap the sub-surface first by attaching a NULL wl_buffer, update parent, and then destroy the sub-surface.
```
Looks like we also need to delay subsurface unmap until we have a new content as it's not synced:

Destroying a sub-surface takes effect immediately. If you need to synchronize the removal of a sub-surface to the parent surface update, unmap the sub-surface first by attaching a NULL wl_buffer, update parent, and then destroy the sub-surface.

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