STR: 1. Click on some text box that will trigger a floating suggestions box. For example, the search box in Firefox. Things that also work include in-page search boxes and login forms that you have password manager data for. 2. Hold down the Windows key and press one of the arrow keys to change the place that your window is aligned. 3. Notice how the floating list does not change position. This was tested on a Nightly build from 12/19/13, and has also been seen on Firefox 26.0 stable. I'm on Windows 7.
Created attachment 8350601 [details] search suggestions list.png Confirmed 29.0a1 (2013-12-19), win 7 x64
The popup should be closed when the window moves. Likely, we just need to add a check for the right message (WM_WINDOWPOSCHANGING or WM_WINDOWPOSCHANGED probably) to DealWithPopups.
Component: XUL → Widget: Win32
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