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Line breakpoints are independent of a particular language. All debuggers likely have a concept of line breakpoints. Therefore to make it easier to integrate a new debugger, a LineBreakpoint class should be introduced with properties like URL and a line number. Debugger Core UI could then provide a LineToggleBreakpoint action, that would submit a line breakpoint. That action can be registered for the desired MIME type.
We might need an abstraction for other breakpoint types as well to solve issues like #181481.
Thanks!