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backends: Check that buffer age is available when checking damage history

Carlos Garnacho requested to merge carlosg/mutter:wip/carlosg/check-buffer-age-feature into main

This used to be the case before the refactor at commit 43cee4b6, use_clipped_redraw would be unset before the larger check if has_buffer_age was set, but clutter_damage_history_is_age_valid() was FALSE. This got replaced by a check just on the latter, which will also be FALSE if has_buffer_age is not present.

We have other means to achieve clipped redraws, so this slight change culled all of them.

Fixes: 43cee4b6 ("stage-impl: Do clipped redraws when drawing offscreen") Closes: #2771 (closed)

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