Bug 478519 - GtkTooltip segfaults on NULL gdk-display-current-tooltip
Make the tooltip code a bit more robust for a case that only occurs when GTK+ is used from a language binding. It looks like this case appears because the memory management / ref counting is handled differently in some of the language bindings. Instead of asserting, we will fail silently. Also fix a think-o in gtk_tooltip_start_delay(). Patch from O. Andrieu.
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