Don't call updateEditors when there are no editors on that file #2890
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Callees from updateEditors, including arbitrary third-party notification providers, can have side-effects, such as instantiating PsiFile instances for the VirtualFiles. These PsiFiles can then be spurious: if there is more than one project open, we might end up with a PsiFile with PsiFile.project = ProjectA, where the VirtualFile in fact belongs to ProjectB.
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Callees from updateEditors, including arbitrary third-party notification providers, can have side-effects, such as instantiating PsiFile instances for the VirtualFiles. These PsiFiles can then be spurious: if there is more than one project open, we might end up with a PsiFile with PsiFile.project = ProjectA, where the VirtualFile in fact belongs to ProjectB.