D10381: [ToolTipArea] Add "aboutToShow" signal

[Marco Martin]

mart accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D10381

To: broulik, #plasma, mart
Cc: plasma-devel, #frameworks, michaelh, ZrenBot, ngraham, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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