D22543: [LNF KCM] make it possible to close the preview

[Nathaniel Graham]

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

REVISION SUMMARY
  The preview window doesn't respond to setting its visibility to false, so currently
  it can't actually be closed without using the task manager or another external way
  of closing windows.
  
  Fix the issue by triggering the window's `close()` function instead.

TEST PLAN
  Preview a theme and click on the close button, or anywhere else, or hit the Esc key

REPOSITORY
  R119 Plasma Desktop

BRANCH
  make-lnf-preview-escapeable (branched from Plasma/5.16)

REVISION DETAIL
  https://phabricator.kde.org/D22543

AFFECTED FILES
  kcms/lookandfeel/package/contents/ui/main.qml

To: ngraham, #plasma, apol
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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