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Under Windows XP with Classic L&F, with the NetBeans window maximized on a 1900x1200 screen and using -J-Dnetbeans.winsys.statusLine.in.menuBar=true, the moving blue rectangle in the "running task" indicator leaves 1-pixel wide blue columns behind when it is moving to the left. This rendering bug is new in 7.1.2, it wasn't present in 7.1.1 and earlier.
Created attachment 119036 [details] Screenshot showing the rendering bug.
cannot reproduce in: Product Version: NetBeans IDE Dev (Build 20120427-bd3f8a404011) Java: 1.7.0_03; Java HotSpot(TM) Client VM 22.1-b02 System: Windows 7 version 6.1 running on x86; Cp1250; en_US (nb) (with Windows Classic theme)
Can't reproduce it in Build 201205030400 too, so it seems to have been fixed.