D11481: [KItemListView] Check if KItemListStyleOption actually changed before emitting a change

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Dolphin, elvisangelaccio.
broulik requested review of this revision.

REVISION SUMMARY
  The preview generator waits for everything to have settled a bit and starts a timer of 200ms before generating a preview. This timer was fired everytime when entering a folder needlessly delaying preview generation since it never checked whether the style option actually changed.

TEST PLAN
  - Previews generate noticeably faster when moving between folders with the same icon size and settings.
  - Switching between view modes still works
  - Navigating between folders of varying view modes still triggers the old delay

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D11481

AFFECTED FILES
  src/kitemviews/kitemliststyleoption.cpp
  src/kitemviews/kitemliststyleoption.h
  src/kitemviews/kitemlistview.cpp

To: broulik, #dolphin, elvisangelaccio
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