D18646: [Colors KCM] Add search and filter

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  This adds a search bar to search for schemes in the list as well as a filter to show only light or dark themes using a heuristic on the theme's window color.

TEST PLAN
  F6581348: Screenshot_20190201_161444.png <https://phabricator.kde.org/F6581348>
  
  Should the filter be cleared when you install a new theme to avoid it being hidden by a filter?
  When a filter is active, the filter icon turns blue.
  
  There's some minor right-to-left layout issues

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D18646

AFFECTED FILES
  kcms/colors/CMakeLists.txt
  kcms/colors/colors.cpp
  kcms/colors/colors.h
  kcms/colors/filterproxymodel.cpp
  kcms/colors/filterproxymodel.h
  kcms/colors/package/contents/ui/TextFieldButton.qml
  kcms/colors/package/contents/ui/main.qml

To: broulik, #plasma, #vdg
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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