D8496: Very lightweight cache over device enumeration

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  On startup various areas of frameworks fetch solid devices. Typically in
  quick succession for the same type. Caching this list saves us plenty of
  cycles
  
  To keep things simple and safe, rather than complicatedly tracking
  things, we just reset the cache whenever any device changes.

REPOSITORY
  R245 Solid

REVISION DETAIL
  https://phabricator.kde.org/D8496

AFFECTED FILES
  src/solid/devices/backends/udev/udevmanager.cpp

To: davidedmundson
Cc: #frameworks
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