Services::full_path now returns None when the working directory can't be
read, instead of the relative path. file.runScript still runs the script
but does not add it to the list, so a later working directory can't make
the entry open a different file.
File > Scripts lists a bundled script even when an installed ScriptUI
panel has the same name, but running it by name opened the panel. A
script now runs before a panel of the same name, and it enters Recent
Script Files.
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