shell/window-preview-layout: Mark return value as nullable
The function may return null, so we should mark it as such, even if that information is currently unused. https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/6351 Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2622>
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@ -354,7 +354,7 @@ shell_window_preview_layout_class_init (ShellWindowPreviewLayoutClass *klass)
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* to the container. If @window is already part of the preview, this
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* function will do nothing.
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*
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* Returns: (transfer none): The newly created actor drawing @window
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* Returns: (nullable) (transfer none): The newly created actor drawing @window
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*/
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ClutterActor *
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shell_window_preview_layout_add_window (ShellWindowPreviewLayout *self,
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