Re-insert AMP Preview button whenever editor toolbar changes #6900
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Summary
Fixes #6893
The AMP Preview button should be re-inserted into the block editor DOM tree whenever settings in the post editor header change. The following properties may indicate such a change in the toolbar layout:
viewable
prop; it gets defined once the toolbar has been renderedsaveable
prop; when it changes, the toolbar has been reshuffled heavilyChecklist