EventStream produces sequence of KeyEvents instead of mouse ScrollUp/ScrollDown

[chyvonomys]

Describe the bug
I'm using EventStream like this:

        futures_executor::block_on(async {
            let mut term_events = EventStream::new();
            while !grid.is_done() {
                let dirty = if let Some(Ok(e)) = term_events.next().await {
                    self.process_terminal_event(e, grid)
                } else {
                    break
                };

                match dirty {
                    Update::Nothing => (),
                    Update::All => {
                        grid.draw(self);
                    },
                    _ => grid.draw(self),
                }
            }
        });

In process_terminal_event I log all incoming events to a file. If I do some continuous scroll up/down with two finger gesture on MacOS I get sequence of Key events (that btw looks like some mouse sequence ^[[<65;118;23M) in the middle of ScrollDown events.

...
Mouse(MouseEvent { kind: ScrollDown, column: 117, row: 22, modifiers: NONE })
Mouse(MouseEvent { kind: ScrollDown, column: 117, row: 22, modifiers: NONE })
Mouse(MouseEvent { kind: ScrollDown, column: 117, row: 22, modifiers: NONE })
Key(KeyEvent { code: Esc, modifiers: NONE })
Key(KeyEvent { code: Char('['), modifiers: NONE })
Key(KeyEvent { code: Char('<'), modifiers: NONE })
Key(KeyEvent { code: Char('6'), modifiers: NONE })
Key(KeyEvent { code: Char('5'), modifiers: NONE })
Key(KeyEvent { code: Char(';'), modifiers: NONE })
Key(KeyEvent { code: Char('1'), modifiers: NONE })
Key(KeyEvent { code: Char('1'), modifiers: NONE })
Key(KeyEvent { code: Char('8'), modifiers: NONE })
Key(KeyEvent { code: Char(';'), modifiers: NONE })
Key(KeyEvent { code: Char('2'), modifiers: NONE })
Key(KeyEvent { code: Char('3'), modifiers: NONE })
Key(KeyEvent { code: Char('M'), modifiers: SHIFT })
Mouse(MouseEvent { kind: ScrollDown, column: 117, row: 22, modifiers: NONE })
Mouse(MouseEvent { kind: ScrollDown, column: 117, row: 22, modifiers: NONE })
Mouse(MouseEvent { kind: ScrollDown, column: 117, row: 22, modifiers: NONE })
...

Observation: this escape sequence has x, y coordination off by one compared to ScrollDown events.

To Reproduce
See above.

Expected behavior
Raw escape sequence should not appear in EventStream.

OS
MacOS Catalina 10.15.5

Terminal/Console

• kitty 0.18.3
• Terminal 2.10 (433)

[TimonPost]

You have executed 'EnableMouseCapture' and raw modes?

[chyvonomys]

@TimonPost yes, at the beginning I do this:

        terminal::enable_raw_mode().unwrap();
        execute!(
            self.screen,
            terminal::EnterAlternateScreen,
            crossterm::event::EnableMouseCapture,
        ).unwrap();

self.screen is basically std::io::stdout()

[TimonPost]

That is odd. Will have to investigate it a bit.

[TimonPost]

Ah, I am afraid using gestures and two fingers is not yet supported. I'll move his issue to: #685

[chyvonomys]

@TimonPost hmm, gesture is in fact supported because it does recognize it as ScrollDown, column: 117, row: 22 most of the time. but sometimes it suddenly refuses to recognize and returns it as raw sequence: ^[[<65;118;23M