SL-20441 Do not recreate desktop shortcut when updating

indra/newview/installers/windows/installer_template.nsi

@@ -398,8 +398,18 @@ CreateShortCut	"$SMPROGRAMS\$INSTSHORTCUT\Uninstall $INSTSHORTCUT.lnk" \
 
 # Other shortcuts
 SetOutPath "$INSTDIR"
-CreateShortCut "$DESKTOP\$INSTSHORTCUT.lnk" \
+
+Push $0
+${GetParameters} $COMMANDLINE
+${GetOptionsS} $COMMANDLINE "/marker" $0
+# Returns error if option does not exist
+IfErrors 0 DESKTOP_SHORTCUT_DONE
+  # "/marker" is set by updater, do not recreate desktop shortcut
+  CreateShortCut "$DESKTOP\$INSTSHORTCUT.lnk" \
         "$INSTDIR\$VIEWER_EXE" "$SHORTCUT_LANG_PARAM" "$INSTDIR\$VIEWER_EXE"
+
+DESKTOP_SHORTCUT_DONE:
+Pop $0
 CreateShortCut "$INSTDIR\$INSTSHORTCUT.lnk" \
         "$INSTDIR\$VIEWER_EXE" "$SHORTCUT_LANG_PARAM" "$INSTDIR\$VIEWER_EXE"
 CreateShortCut "$INSTDIR\Uninstall $INSTSHORTCUT.lnk" \