D10381: [ToolTipArea] Add "aboutToShow" signal

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
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Restricted Application added subscribers: Frameworks, plasma-devel.
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REVISION SUMMARY
  This is emitted just before the tooltip is shown and allows the user to defer heavy lifting to when the dialog is actually shown.

TEST PLAN
  Task Manager re-uses its tooltip delegate and populates it in `onContainsMouseChanged` leading to unneccessary workload done by just moving the mouse over TM

REPOSITORY
  R242 Plasma Framework (Library)

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

AFFECTED FILES
  src/declarativeimports/core/tooltip.cpp
  src/declarativeimports/core/tooltip.h

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