04/23 Enhance app functionalities

app.py

@@ -39,8 +39,12 @@ class App(tk.Tk):
         self.current_user  = None
         self._idle_timer   = None   # after() handle for timeout
         self._warning_timer = None  # after() handle for 1-min warning
+        self._idle_last_reset = 0.0 # monotonic timestamp of last actual reset
 
-        # Bind all user activity events to reset the idle timer
+        # Bind all user activity events to reset the idle timer.
+        # <Motion> fires continuously — the handler throttles itself to at most
+        # once every 5 seconds so we don't schedule/cancel hundreds of after()
+        # handles per second during normal mouse movement.
         for event in ("<Motion>", "<KeyPress>", "<ButtonPress>", "<MouseWheel>"):
             self.bind_all(event, self._reset_idle_timer, add="+")
 
@@ -333,11 +337,35 @@ class App(tk.Tk):
 
     # ─── Session Timeout ──────────────────────────────────────────────────────
 
+    # Minimum interval (seconds) between idle-timer resets triggered by
+    # continuous events like <Motion>.  KeyPress / ButtonPress always reset
+    # immediately (they are infrequent by nature).
+    _IDLE_THROTTLE_S = 5.0
+
     def _reset_idle_timer(self, event=None):
-        """Cancel any pending timeout/warning timers and restart them."""
+        """Cancel any pending timeout/warning timers and restart them.
+
+        Throttled for <Motion> events: the timer is only rescheduled if at
+        least _IDLE_THROTTLE_S seconds have elapsed since the last reset.
+        This prevents hundreds of after_cancel/after() calls per second
+        during normal mouse movement without affecting correctness.
+        """
         if not self.current_user:
             return  # not logged in — nothing to time out
 
+        import time
+        # Throttle continuous motion events; discrete actions always go through
+        if event and getattr(event, "type", None) is not None:
+            try:
+                # EventType.Motion == 6 in tkinter
+                if int(event.type) == 6:
+                    now = time.monotonic()
+                    if now - self._idle_last_reset < self._IDLE_THROTTLE_S:
+                        return
+                    self._idle_last_reset = now
+            except Exception:
+                pass
+
         if self._idle_timer:
             self.after_cancel(self._idle_timer)
         if self._warning_timer: