Public bug reported:
Could be useful to emit a signal when a widget is visible/hidden.
It will be emitted when, for example, a widget is hidden when moving through
notebook's tabs.
** Affects: gtk+2.0 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/715224
Title:
emit "child-visible", "child-not-visible" signals when a GtkWidget
is/isn't visible
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