[Bug gdb/29831] event loop deadlocks when using continue in breakpoint command and using gdb.execute in stop event hook written in Python

["dominik.b.czarnota+bugzilla at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29831

--- Comment #1 from Disconnect3d <dominik.b.czarnota+bugzilla at gmail dot com> ---
This can be worked around in the following way. However, this is not a good
solution since this means one can't script GDB using both its native CLI
commands and Python at the same time.

```
import gdb
def stop_handler (event):
    print("Python stop handler started")
    print("Thread is stopped: " + str(gdb.selected_thread().is_stopped()))
    print("Thread is running: " + str(gdb.selected_thread().is_running()))
    (gdb.execute("",to_string=True))
    print("Thread is stopped: " + str(gdb.selected_thread().is_stopped()))
    print("Thread is running: " + str(gdb.selected_thread().is_running()))
    print("Python Stop handler finished\n")
gdb.events.stop.connect (stop_handler)


class Bp(gdb.Breakpoint):
    def stop(self):
        print("Breakpoint hit!")
        return True

Bp("foo")
```

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