D12321: Hide file preview when icon is too small

[Nathaniel Graham]

ngraham added a task: T8552: Polish Open/Save dialogs.

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D12321

To: anemeth, #vdg, #frameworks, ngraham, rkflx
Cc: rkflx, ngraham, #frameworks, michaelh, bruns