[ToolTipManager] Create DolphinFileMetaDataWidget on-demand again
This reverts b7fbd19a but creates the widget only once and then reuses it.
However, ownership of a parent-less widget is transferred to the
KToolTipWidget but since we first request metadata, then show the
tooltip (or won't if the mouse moved on since), we cannot rely on
the KToolTipWidget exclusively.
Instead, when we still delete the widget ourself until we have
shown the KToolTipWidget once at which point it will handle the
life time for us.
This fixes parenting the widget to DolphinView which would make
it appear as a broken line in the top left of the window.
Fixes this artifact I noticed, also saves creating the widget in the first place if tooltips are off (the default)
Edited by Kai Uwe Broulik