Nice bug discovered in web GMail on desktop

To reproduce, go to a folder/label/tab that has at least one message with an attachment (like a PDF, or video), then click the "select all" button to make all messages on the page are selected (50 or less, DO NOT "select all 3000 messages"), then right click the attachment and choose the bottom option "Open in new window", sit back and watch as 50 (or whatever the number of messages on that page) of windows open for your attachment.