SelectionList weird behavior when removing options in its own event handler until freeze

[jvllmr]

When you interact with a SelectionList and remove the option in one of the event handlers one of the following happens:

• Wrong options is removed
• Option just deselects
• Entire component just freezes (not the entire app; most likely occurs with the first or last option in the Selection List)

Example code:

from textual.app import App
from textual.widgets import SelectionList
from textual.widgets.selection_list import Selection
from textual.widget import Widget
import typing as t
from string import ascii_letters


class MyApp(App[str]):
    def compose(self) -> t.Iterable[Widget]:
        yield SelectionList(
            *[Selection(letter, letter, True, letter) for letter in ascii_letters],
        )

    def on_selection_list_selection_toggled(
        self, event: SelectionList.SelectionToggled[str]
    ) -> None:
        id_ = event.selection.id
        if id_ is not None:
            event.selection_list.remove_option(id_)


if __name__ == "__main__":
    app = MyApp()
    app.run()

It will be helpful if you run the following command and paste the results:

Textual Diagnostics

Versions

Name	Value
Textual	0.58.0
Rich	13.7.1

Python

Name	Value
Version	3.11.2
Implementation	CPython
Compiler	GCC 12.2.0
Executable	/home/jan/Documents/dev/trove-setup/.venv/bin/python

Operating System

Name	Value
System	Linux
Release	6.1.0-17-amd64
Version	#1 SMP PREEMPT_DYNAMIC Debian 6.1.69-1 (2023-12-30)

Terminal

Name	Value
Terminal Application	vscode (1.88.1)
TERM	xterm-256color
COLORTERM	truecolor
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=208, height=17
legacy_windows	False
min_width	1
max_width	208
is_terminal	True
encoding	utf-8
max_height	17
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

Video:

2024-04-29_19-33-11.mp4

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