Description of the Issue
Occasionally I see a tab appear to be pressed even though it is not the active tab. I don't have steps to reproduce. I can build Notepad++ on this computer so let me know if there's anything I can do to help gather more details the next time it happens.
Expected Behavior
For only the selected tab to appear pressed.
Actual Behavior
Screenshot:

Version
Notepad 7.4.2 x86 in Windows 8.1 x64.