D28280: [kcms/baloo] Refine UI and prepare for more indexing options in the future

[Nathaniel Graham]

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

REVISION SUMMARY
  This patch refines the UI added in D28025 <https://phabricator.kde.org/D28025>. The basic goal here is to to be able to choose
  what type of indexing is done for each path (none, full, or metadata only). I wrestled
  for a while with the best way to present this information and also allow it to be easily
  changed and eventually settled on a combobox, given that it combines both functions into
  one compact control.
  
  The code is made flexible so that once metadata-only indexing is added in the future, it
  will be easy to add the appropriate option into the UI.

TEST PLAN
  F8198344: vokoscreenNG-2020-03-25_08-28-23.webm <https://phabricator.kde.org/F8198344>

REPOSITORY
  R119 Plasma Desktop

BRANCH
  refine-baloo-kcm-ui (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D28280

AFFECTED FILES
  kcms/baloo/filteredfoldermodel.cpp
  kcms/baloo/filteredfoldermodel.h
  kcms/baloo/package/contents/ui/main.qml

To: ngraham, #vdg, #baloo, #plasma
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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