TextBuffer.addOnApplyTag

Emitted to apply a tag to a range of text in a GtkTextBuffer.

Applying actually occurs in the default handler.

Note that if your handler runs before the default handler it must not invalidate the @start and @end iters (or has to revalidate them).

See also: [method@Gtk.TextBuffer.apply_tag], [method@Gtk.TextBuffer.insert_with_tags], [method@Gtk.TextBuffer.insert_range].