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Following PR #169744 the DAP launch sequencing of Dexter was changed to complete a launch request/response before performing configuration steps. This matches LLDB's current behaviour, but is not compatible with the DAP specification and causes issues interfacing with other debuggers. This patch tries to bridge the gap by using a sequencing that is mostly DAP-compliant while still interfacing correctly with lldb-dap: we send a launch request first, then perform all configuration steps and send configurationDone, and then await the launch response. For lldb-dap, we do not wait for the launch response and may send configuration requests before it is received, but lldb-dap appears to handle this without issue. For other debug adapters, the launch request will be ignored until the configurationDone request is received and responded to, at which point the launch request will be acted upon and responded to. As an additional note, the initialized event should be sent after the initialize response and before the launch request according to the spec, but as LLDB currently sends it after the launch response Dexter has avoided checking for it. Since the initialized event is now being sent after the launch response by LLDB, we can start checking for it earlier in the sequence as well (though technically the client should receive the initialized event before it sends the launch request).
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