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(Easiest to see with a graphics debugging tool like QuartzDebug for the mac - each area that's repainted flashes yellow). Pick an explorer node for a file that is already open. Right click it and choose Open. The entire main window repaints. Really nothing should happen except the editor should get focus and the active component should change. Doesn't quite merit the performance keyword, but almost qualifies.
Assigning to Tim
Not critical for 4.0, enough stuff goes on when opening a file that could be optimized with much bigger impact.
reassigning
I've tried in today's build (20041017) in the described scenario, I've got only the editor documents area repainted and the some individual toolbar icons. (at least that's what I noticed by looking at the yellow spots when using QuartzDebug) I guess the problem was fixed during 4.0 lifecycle..
verified