D12328: Enable preview by default in the filepicker dialog

[Alex Nemeth]

anemeth marked an inline comment as not done.

REVISION DETAIL
  https://phabricator.kde.org/D12328

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