F3 Key triggers CursorPosition event, ignores Bindings in some terminals #6242
Description
Have you checked closed issues? (https://github.com/Textualize/textual/issues?q=is%3Aissue+is%3Aclosed)
Yes
Have you checked against the most recent version of Textual? (https://pypi.org/search/?q=textual)
Yes
The bug
A plain App instance with a binding for the f3 key does not trigger the action bound. The console does not show any Key events, only a CursorPosition event gets logged, contrary to most other keys.
An example app that triggers this below, note that I added two bindings to the test action, to demonstrate the difference. You can remove the f2 binding and the issue will still happen, this just allows easier validation that the action is not malformatted.
from textual.app import App, ComposeResult, SystemCommand
class MyApp(App):
BINDINGS = [("f3,f2", "test", "Test")]
def action_test(self):
self.notify("Test succeeded")
if __name__ == "__main__":
app = MyApp()
app.run()An example of the logged CursorPosition:
[10:55:46] EVENT message_pump.py:822
CursorPosition(x=128, y=0) >>> CawApp(title='CAW Client', classes={'-dark-mode'}, pseudo_classes={'focus',
'dark'}) method=None
this log entry has a horizontal entry above and below in the console.
In textual-keys the f3 key shows up normally. This issue has been triggered on the terminals kitty and foot. It works correctly in XTerm, UXterm, GNOME terminal and cool-retro-term.
I found this vim mailing list entry which gives some pointers.
Diagnosis output:
Kitty diagnosis
Textual Diagnostics
Versions
| Name | Value |
|---|---|
| Textual | 6.5.0 |
| Rich | 14.2.0 |
Python
| Name | Value |
|---|---|
| Version | 3.12.5 |
| Implementation | CPython |
| Compiler | Clang 18.1.8 |
| Executable | /home/idlab261/projects/cawclient/.venv/bin/python3 |
Operating System
| Name | Value |
|---|---|
| System | Linux |
| Release | 6.8.0-87-generic |
| Version | #88~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Oct 14 14:03:14 UTC 2 |
Terminal
| Name | Value |
|---|---|
| Terminal Application | Unknown |
| TERM | xterm-kitty |
| COLORTERM | truecolor |
| FORCE_COLOR | Not set |
| NO_COLOR | Not set |
Rich Console options
| Name | Value |
|---|---|
| size | width=106, height=58 |
| legacy_windows | False |
| min_width | 1 |
| max_width | 106 |
| is_terminal | True |
| encoding | utf-8 |
| max_height | 58 |
| justify | None |
| overflow | None |
| no_wrap | False |
| highlight | None |
| markup | None |
| height | None |