Add salt attribute to dir and remap-dir elements
'salt' attribute affects a cache filename to generate different name from directory name. This is useful when sharing caches with host on sandbox and/or give a filename differently: <dir salt="randomdata">/usr/share/fonts</dir> <remap-dir as-path="/usr/share/fonts" salt="salt for /usr/share/fonts on host">/run/host/fonts</remap-dir> Applications can read caches as-is for fonts on /run/host/fonts where is mounted from host. and write a cache for their own fonts on /usr/share/fonts with different name.
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