Widget.sendExpose

Very rarely-used function. This function is used to emit an expose event on a widget. This function is not normally used directly. The only time it is used is when propagating an expose event to a windowless child widget ([gtk.widget.Widget.getHasWindow] is false), and that is normally done using [gtk.container.Container.propagateDraw].

If you want to force an area of a window to be redrawn, use [gdk.window.Window.invalidateRect] or [gdk.window.Window.invalidateRegion]. To cause the redraw to be done immediately, follow that call with a call to [gdk.window.Window.processUpdates].