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Information dialog that port is already in use appears when 2 instances of IDE are used at once. It causes problems when UI tests are executed in one of IDE's. This dialog should be suppressed when netbeans.fullhack=true is defined. The property is used for automated tests. Other similar dialogs are suppressed. It is in class org.netbeans.modules.openfile.Server - line 113 (see attached diff).
Created attachment 10451 [details] Diff of proposed solution
The patch is applied in the trunk. Please verify it.
Verified in build 200305300100.