D29152: Allow PlaceholderMessage to be text-less

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: iasensio, mart, Kirigami.
Herald added a project: Kirigami.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Requested by @iasensio for the KWin Rules KCM patch (D29141 <https://phabricator.kde.org/D29141>). Could be useful for other
  uses too, e.g. an app loading screen where you would define an icon and a custom progress
  bar, but wouldn't need text.

TEST PLAN
  F8257685: Screenshot_20200424_074145.png <https://phabricator.kde.org/F8257685>

REPOSITORY
  R169 Kirigami

BRANCH
  allow-PlaceholderMessage-to-omit-text (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29152

AFFECTED FILES
  src/controls/PlaceholderMessage.qml

To: ngraham, iasensio, mart, #kirigami
Cc: iasensio, plasma-devel, fbampaloukas, GB_2, domson, dkardarakos, ngraham, apol, ahiemstra, davidedmundson, mart
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