Attempt to prevent thread lock that is causing freeze.

src/fenrirscreenreader/screenDriver/ptyDriver.py

@@ -9,6 +9,7 @@ import getpass
 import os
 import pty
 import shlex
+from queue import Full
 import signal
 import struct
 import sys
@@ -316,6 +317,7 @@ class driver(screenDriver):
 
         event_time = time.time()
         for event_state in [1, 0]:
+            try:
                 event_queue.put(
                     {
                         "Type": FenrirEventType.keyboard_input,
@@ -327,7 +329,13 @@ class driver(screenDriver):
                             "event_state": event_state,
                             "event_type": 0,
                         },
-                }
+                    },
+                    block=False,
+                )
+            except Full:
+                self.env["runtime"]["DebugManager"].write_debug_out(
+                    "ptyDriver synthesize_backspace_shortcut: Event queue full, dropping backspace events",
+                    debug.DebugLevel.WARNING,
                 )
         return True