D25160: [Folder View] Use an inactive highlight effect when something else has focus

[Nathaniel Graham]

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

REVISION SUMMARY
  The theme SVG doesn't have a concept of "inactive selection highlight", so we need to
  manufacture our own by reducing the opacity of the selection highlight.
  
  Thanks to @broulik for suggesting the necessary code changes in the bug report.
  
  FEATURE: 375501
  FIXED-IN: 5.18.0

TEST PLAN
  F7743147: demo-2019-11-05_12.23.53.webm <https://phabricator.kde.org/F7743147>

REPOSITORY
  R119 Plasma Desktop

BRANCH
  folder-view-inactive-selection-highlight (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D25160

AFFECTED FILES
  containments/desktop/package/contents/ui/FolderItemDelegate.qml

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