widget and all its descendants for a GtkLabel
widget with a text string matching label.pattern.
The label.pattern may contain asterisks '*' and question marks '?' as
placeholders, gPatternMatch() is used for the matching.
Note that locales other than "C" tend to alter (translate" label strings,
so this function is genrally only useful in test programs with
predetermined locales, see gtkTestInit() for more details.gtkTestFindLabel(widget, label.pattern)widgetlabel.patternGtkWidget] a GtkLabel widget if any is found.