Fix download button waiting if document has started but not completed downloading #4455
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Fixes #1826
The "download from cache" feature works like a charm but is currently triggered when a document starts downloading/displaying. (A plain "download from URL" is used when the document has not even started that). This commit keeps track of a document's download completion status and falls back to "download from URL" if it is not in the cache, making the download button consistently responsive.