Created attachment 8334664 [details] Снимок экрана (209).png User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0 (Beta/Release) Build ID: 20131119030202 Steps to reproduce: The extra line when you drag a tab Australis
Summary: The extra line when you drag a tab → Australis, Windows, LWT: White line bleeds through on selected tab when you drag a tab
Matt, I recall talking about this with you. Do you have any idea how hard a fix this is?
This was one of the tradeoffs from the LWT approach (see bug 813786 comment 44) accepted from the beginning. I don't know of a way to fix this while still covering the border of the selected tab in the default case.
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