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Copy/paste of a missing file does not show any errors
Add a file to the project, then rename it on disk, and then try to copy it in Solution Explorer and paste it in some project folder. Nothing happens since the source file isn't there, but there's no error notifying the user of that, either - the operation
just silently fails.
This also happens for files that are added as links, and file nodes that are produced by "Show All Files" mode whenever it's possible to get them out of sync (e.g. by using symlinks).