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512f5221 - [Model] Gemma4: add bidirectional vision attention for sliding layers with window guard (#40534)

[Model] Gemma4: add bidirectional vision attention for sliding layers with window guard (#40534) Signed-off-by: Luciano Martins <lucianommartins@users.noreply.github.com> Signed-off-by: Luciano Martins <lucianomartins@google.com> Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn> Co-authored-by: Luciano Martins <lucianommartins@users.noreply.github.com> Co-authored-by: Isotr0py <2037008807@qq.com> Co-authored-by: Isotr0py <mozf@mail2.sysu.edu.cn>