NSIS plugin does not support silent uninstall.

NSIS does support silent uninstall by adding a /S argument when calling the uninstaller. The uninstall script generated from the nsis-plugin however displays a dialog box ("xyz has been uninstalled") regardless of the presence of the /S flag.

This prevents project automation (as it requires someone who clicks OK to close the dialog). Actually we found this while scripting a simple install-run-uninstall-test.

The easiest way to fix this would be the removal of the messageBox call. Showing the messageBox conditionally should be possible too.