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Emacs stores images in an image cache when it displays them, so it can display them again more efficiently. It removes an image from the cache when it hasn't been displayed for a specified period of time.
When an image is looked up in the cache, its specification is compared
with cached image specifications using
equal. This means that
all images with equal specifications share the same image in the cache.
If the value is
nil, Emacs does not remove images from the cache
except when you explicitly clear it. This mode can be useful for
nil, only the cache for that frame is cleared. Otherwise all frames' caches are cleared.
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