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Problem: Both handle lookups write into the same `Error` before either one is checked, and `api_set_error()` unconditionally `xmalloc`s `err->msg` without freeing what is already there. When both handles are invalid, the message allocated for the window is silently overwritten by the one for the buffer and leaked. Solution: Check the window before looking up the buffer. As a side effect the reported error no longer names the buffer when the window was wrong too. AI-assisted