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0b7de6d3ee
According to the DAP specification if the "sourceReference" field is included in a Source object, then the DAP client _must_ make a "source" request to the debugger to retrieve file contents, even if the Source object also includes path information. If the Source's path field is a valid path that the DAP client is able to read from the filesystem, having to make another request to the debugger to get the file contents is wasteful and leads to incorrect results (DAP clients will try to get the contents from the server and display those contents as a file with the name in "source.path", but this will conflict with the _acutal_ existing file at "source.path"). Instead, only set "sourceReference" if the source file path does not exist. Approved-By: Tom Tromey <tom@tromey.com>