CVE-2023-46246: Use After Free

Vim is an improved version of the good old UNIX editor Vi. Heap-use-after-free in memory allocated in the function gagrowinner in in the file src/alloc.c at line 748, which is freed in the file src/exdocmd.c in the function docmdline at line 1010 and then used again in src/cmdhist.c at line 759...