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Fixes #22524. This affects both the banner in the main compose box and the banner in the message edit compose box. The use of ProgressBar has been replaced with a more simple CSS (with light Javascript) solution. The classnames are changing because the upload banner is now a template rendered and remove()-ed from a banner container (#compose_banners in the composebox, and a new div for banners in the message edit view). It used to be in the send_status container so there are a lot of class renames across the codebase.