In answer to my own second question, this seems to work fine to get a GC that
draws and clears appropriately.
values.foreground.pixel =
widget->style->fg[GTK_WIDGET_STATE(widget)].pixel ^
widget->style->bg[GTK_WIDGET_STATE(widget)].pixel;
(void) memset((char *) &values.background, 0, sizeof(GdkColor));
values.function = GDK_XOR;
xor_gc = gdk_gc_new_with_values(widget->window, &values,
GDK_GC_FOREGROUND|GDK_GC_BACKGROUND|
GDK_GC_FUNCTION);
What I don't know is if this behaves as expected on Windows as well. Anyone
tried this on a Win box?
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