Saves the context state.
This allows temporary modifications done through gtk.style_context.StyleContext.addClass, gtk.style_context.StyleContext.removeClass, gtk.style_context.StyleContext.setState to be quickly reverted in one go through gtk.style_context.StyleContext.restore.
The matching call to gtk.style_context.StyleContext.restore must be done before GTK returns to the main loop.
Deprecated: This API will be removed in GTK 5
Saves the context state.
This allows temporary modifications done through gtk.style_context.StyleContext.addClass, gtk.style_context.StyleContext.removeClass, gtk.style_context.StyleContext.setState to be quickly reverted in one go through gtk.style_context.StyleContext.restore.
The matching call to gtk.style_context.StyleContext.restore must be done before GTK returns to the main loop.