User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a8pre) Gecko/2007081205 Minefield/3.0a8pre Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a8pre) Gecko/2007081205 Minefield/3.0a8pre The newly added splitter in bug 267831 makes "fixed-width" elements (e.g. buttons) shrink when put next to it. Given the following configuration: URL Bar, new Window button, Splitter, Search Bar. The splitter will size the Search Bar correctly, but the URL Bar will stay the same width. Instead, the new Window button will be "flexed". See attached screenshot for clarification. Adding two fixed-width elements on each side will make it behave even more awkwardly. Reproducible: Always
Created attachment 276493 [details] Showing the problems with fixed-width elements put next to the splitter I use a custom theme here, but it happens on the default theme as well, I checked that before.