D25683: KDirOperator: Use a fixed line height for scroll speed

[Elvis Angelaccio]

elvisangelaccio accepted this revision.

REPOSITORY
  R241 KIO

BRANCH
  diroperator_scrollspeed

REVISION DETAIL
  https://phabricator.kde.org/D25683

To: ahiemstra, ngraham, elvisangelaccio
Cc: ngraham, kde-frameworks-devel, LeGast00n, GB_2, michaelh, bruns