D19748: [Desktop Theme KCM] "Normalize" margin around background in previews

[Friedrich W. H. Kossebau]

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

REVISION SUMMARY
  Instead of a hard-coded hack for a single theme ("Air") to deal with themes
  with large margins, having a generic hack based on heuristics makes
  non-default themes look better in the preview.
  Not using "widgets/panel-background" for "Air" also results in a better
  preview for Air.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  normalizeplasmathemepreviewmargins

REVISION DETAIL
  https://phabricator.kde.org/D19748

AFFECTED FILES
  kcms/desktoptheme/package/contents/ui/ThemePreview.qml

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