Bug summary

When callingtimer.start(); timer.start() on an already running timer, the previous timer should be stopped before starting a new one. On the macosx backend this causes two timers to be running under the hood.

Code for reproduction

importtimeimportmatplotlib.pyplotasplttimer=plt.figure().canvas.new_timer(interval=1000)timer.add_callback(lambda:print(f"{time.ctime()}"))timer.start()timer.start()plt.pause(2)

Actual outcome

4 prints, 2 per second

Tue Nov  5 09:07:27 2024Tue Nov  5 09:07:27 2024Tue Nov  5 09:07:28 2024Tue Nov  5 09:07:28 2024

Expected outcome

2 prints, 1 per second

Tue Nov  5 09:07:27 2024Tue Nov  5 09:07:28 2024

Additional information

No response

Operating system

macos

Matplotlib Version

main

Matplotlib Backend

macosx

Python version

No response

Jupyter version

No response

Installation

None