broulik created this revision.
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This is emitted just before the tooltip is shown and allows the user to defer
heavy lifting to when the dialog is actually shown.
Task Manager re-uses its tooltip delegate and populates it in
`onContainsMouseChanged` leading to unneccessary workload done by just moving
the mouse over TM
R242 Plasma Framework (Library)
To: broulik, #plasma
Cc: plasma-devel, #frameworks, michaelh, ZrenBot, ngraham, progwolff,
lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart