Wish: add tooltip on the progressbar to indicate the src/target of the copy/sync task

[shen]

currently after a new copy/sync task started, it will show a pregressbar and show status text about currently file been copied.
I often fogot what's the target and source of the copy/sync task. it would be nice if we can add the information into the tooltip or somewhere else to give me a chance to know it..

[Aaron]

Thanks for the suggestion, Shen. Improving this feedback is on our wishlist, and I've added your notes to it.