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When the texture size is invalidated using `invalidate_size()`, the new size will only get calculated the next time `update_size()` is called. This happens e.g. in `meta_shaped_texture_get_preferred_size()` via `ensure_size_valid()`. `update_size()` can chain up to `clutter_content_invalidate_size()` as well as emitting a `size-changed` signal. If this happens during layout, the result is a 'change the layout conditions during layout' issue, causing heavy breakage in e.g. the Shell overview. To fix this, expose `ensure_size_valid()` as API so callers can make sure the texture has a valid size without creating redundant size invalidations calls. Note that if a buffer with a new size is attached we already trigger `update_size()` explicitely, avoiding such situations. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1799>