02c87b1740
Use `BLI_ghash_insert` instead of `BLI_ghash_reinsert` to store images. VSE links stored cache keys for each frame in style of linked list. These links must be maintained when any image/key is removed from the cache. Reinserting can free key without proper relinking, which would lead to accessing this freed key when cache limiting frees images in a frame. This should not happen since reinserting is prevented in `seq_cache_put()`, but it's safer to assert, that key is not stored in hash instead.
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