A JSScript can be explicitly cloned and applied to a new realm. When this is done within the same compartment
as the original JSScript, it maintains its reference to the original ScriptSourceObject. This can lead to the
potentially surprising fact that using Debugger.findScripts({ source }) can return multiple Debugger.Script
objects representing the same function, but in multiple realms.
When we query for breakpoints in a given source, we want to take the first column breakpoint on a given line,
but that needs to apply to all potential instances of the Debugger.Script for that location, not just the first one.
Differential Revision: https://phabricator.services.mozilla.com/D20431
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extra : moz-landing-system : lando
Nicolas Chevobbe
yulia
Victor Porof
Logan Smyth