ui.select .on method duplicates 'popup-hide' event

[ftesser]

First Check

• I added a very descriptive title here.
• This is not a Q&A. I am sure something is wrong with NiceGUI or its documentation.
• I used the GitHub search to find a similar issue and came up empty.

Example Code

from nicegui import ui

def on_popup_hide():
    ui.notify('Popup was hidden!', type='info')
    print('Popup was hidden!')

select = ui.select(['A', 'B', 'C'], label='Choose one')
select.on('popup-hide', on_popup_hide)

ui.run()

Description

After a selection is made and the popup is hidden, the application receives two popup-hide events instead of the expected single event.

This issue has been observed in versions 2.23.0 through 2.23.3 and is not present in version 2.22.2.

Here are the log and the screenshot for a single interaction, which show that two events were triggered.

NiceGUI ready to go on http://localhost:8080, http://xx.xx.xxx.xx:8080, http://xx.xx.xx.xx:8080, http://xx.xx.xx.xx:8080, and http://xx.xx.xx.xx:8080
Popup was hidden!
Popup was hidden!

NiceGUI Version

2.23.3

Python Version

Python 3.13.3

Browser

Firefox, Chrome

Operating System

Linux

Additional Context

No response

[falkoschindler]

Wow, thanks for reporting this issue, @ftesser!

This is super strange. Every event registration seems to be handled twice:

ui.select(['A']).on('popup-hide', ui.notify).on('popup-hide', ui.notify).on('popup-hide', ui.notify)

This causes 6 notifications per click.

Other events behave correctly:

ui.button('Click').on('click', ui.notify).on('click', ui.notify).on('click', ui.notify)

The problem seems to be causes by registering @popup-hide in select.js (PR #5050). But I can't find out where exactly the duplication comes from and why it only occurs for ui.select's popup events and not, e.g., for ui.input().on('keydown.tab', ui.notify).