Fix use of `detach` command in LLDB (#2709)

pwndbg/dbg/lldb/repl/proc.py

@@ -233,16 +233,20 @@ class ProcessDriver:
                 sys.stdout.buffer.write(out.encode(sys.stdout.encoding, errors="backslashreplace"))
                 print()
 
+            if self.debug:
+                print(f"[-] ProcessDriver: LLDB Command Status: {ret.GetStatus():#x}")
+
             # Only call _run_until_next_stop() if the command started the process.
+            start_expected = True
             s = ret.GetStatus()
             if s == lldb.eReturnStatusFailed:
-                return
+                start_expected = False
             if s == lldb.eReturnStatusQuit:
-                return
+                start_expected = False
             if s == lldb.eReturnStatusSuccessFinishResult:
-                return
+                start_expected = False
             if s == lldb.eReturnStatusSuccessFinishNoResult:
-                return
+                start_expected = False
 
             # It's important to note that we can't trigger the resumed event
             # now because the process might've already started, and LLDB
@@ -253,6 +257,15 @@ class ProcessDriver:
             #
             # TODO/FIXME: Find a way to trigger the continued event before the process is resumed in LLDB
 
+            if not start_expected:
+                # Even if the current process has not been resumed, LLDB might
+                # have posted process events for us to handle. Do so now, but
+                # stop right away if there is nothing for us in the listener.
+                #
+                # This lets us handle things like `detach`, which would otherwise
+                # pass as a command that does not change process state at all.
+                self._run_until_next_stop(first_timeout=0, only_if_started=True)
+            else:
                 self._run_until_next_stop()
 
     def run_coroutine(self, coroutine: Coroutine[Any, Any, None]) -> bool: