D25999: Add optional subtitle to grid delegate

[Nathaniel Graham]

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

REVISION SUMMARY
  In various cases, we may want some or all grid delegates to have a subtitle. This patch
  adds such a capability. In order to make room, the vertical spacing between rows is
  slightly increased.

TEST PLAN
  F7818015: Screenshot_20191214_151602.png <https://phabricator.kde.org/F7818015>

REPOSITORY
  R296 KDeclarative

BRANCH
  optional-subtitle (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D25999

AFFECTED FILES
  src/qmlcontrols/kcmcontrols/qml/GridDelegate.qml
  src/qmlcontrols/kcmcontrols/qml/private/GridViewInternal.qml

To: ngraham, #vdg, #plasma, davidedmundson
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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