Called by implementations of GdkPaintable to invalidate their contents.
Unless the contents are invalidated, implementations must guarantee that multiple calls of [method@Gdk.Paintable.snapshot] produce the same output.
This function will emit the [signal@Gdk.Paintable::invalidate-contents] signal.
If a @paintable reports the %GDK_PAINTABLE_STATIC_CONTENTS flag, it must not call this function.
See Implementation
Called by implementations of GdkPaintable to invalidate their contents.
Unless the contents are invalidated, implementations must guarantee that multiple calls of [method@Gdk.Paintable.snapshot] produce the same output.
This function will emit the [signal@Gdk.Paintable::invalidate-contents] signal.
If a @paintable reports the %GDK_PAINTABLE_STATIC_CONTENTS flag, it must not call this function.