Comment 3 for bug 1791280

@Wayne-

I tested this with the latest nightly and appending a sheet that has symbols not available in the symbol table will show you the symbols until you trigger a re-load of the symbol table. Either edit a library or close, reload the schematic. Then the rescue happens. Unless you try to edit the symbol in the schematic. Then the missing symbols show as unmapped.

I think we should be re-mapping on import.