When pasting a file which would overwrite an existing file, the dialog first shows a thinned down version of the file-information which then enlarges when the preview is available. This makes it hard to hit the “yes, really” butten, because it suddenly changes location. Ideally (for me) the dialog would contain pre-sized placeholders at the beginning, which get filled when the preview is available, so the total size of the dialog does not change. Reproducible: Always
*** This bug has been marked as a duplicate of bug 299501 ***