Alt+` and Alt+W triggering menu briefly, how do disable it?

[frnsys]

I'm using a hardware keyboard, and I need Alt+` in particular to use for inputting grave-accented characters, but in termux this triggers this popup menu that shows up for a flash and then disappears, rather than passing the input to the terminal. This also happens for Alt+W.

I've added disable-hardware-keyboard-shortcuts = true to my termux.properties file but that hasn't changed the behavior.

[fitzsim]

I see the same bug on my Android machine.

Here is the logcat output for pressing right-Alt + f:

12-10 10:15:19.870  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=66, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ENTER, scanCode=28, metaState=0, flags=0x8, repeatCount=0, eventTime=22300101234000, downTime=22300015309000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:19.870  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=66, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ENTER, scanCode=28, metaState=0, flags=0x8, repeatCount=0, eventTime=22300101234000, downTime=22300015309000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.211  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=58, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22300437825000, downTime=22300437825000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.211  6073  6073 I Termux:TerminalView: onKeyDown(keyCode=58, isSystem()=false, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22300437825000, downTime=22300437825000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.212  6073  6073 I Termux:TerminalView: KeyEvent#getUnicodeChar(34) returned: 0
12-10 10:15:20.565  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=34, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22300796940000, downTime=22300796940000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.565  6073  6073 I Termux:TerminalView: onKeyDown(keyCode=34, isSystem()=false, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22300796940000, downTime=22300796940000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.565  6073  6073 I Termux:TerminalView: KeyEvent#getUnicodeChar(34) returned: 0
12-10 10:15:20.619  6073  6073 D WindowOnBackDispatcher: setTopOnBackInvokedCallback (unwrapped): android.view.ViewRootImpl$$ExternalSyntheticLambda12@fc87230
12-10 10:15:20.641  6073  6073 D WindowOnBackDispatcher: setTopOnBackInvokedCallback (unwrapped): null
12-10 10:15:20.666  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=58, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x28, repeatCount=0, eventTime=22300887518862, downTime=22300437825000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.666  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=58, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x28, repeatCount=0, eventTime=22300887518862, downTime=22300437825000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.666  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=34, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x28, repeatCount=0, eventTime=22300887518862, downTime=22300796940000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.666  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=34, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x28, repeatCount=0, eventTime=22300887518862, downTime=22300796940000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.695  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=34, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22300926854000, downTime=22300796940000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:20.696  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=34, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22300926854000, downTime=22300796940000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:21.398  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=58, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=0, flags=0x8, repeatCount=0, eventTime=22301623432000, downTime=22300437825000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:21.399  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=58, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ALT_RIGHT, scanCode=100, metaState=0, flags=0x8, repeatCount=0, eventTime=22301623432000, downTime=22300437825000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:21.600  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=114, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_CTRL_RIGHT, scanCode=97, metaState=META_CTRL_ON|META_CTRL_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22301829732000, downTime=22301829732000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:21.601  6073  6073 I Termux:TerminalView: onKeyDown(keyCode=114, isSystem()=false, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_CTRL_RIGHT, scanCode=97, metaState=META_CTRL_ON|META_CTRL_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22301829732000, downTime=22301829732000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:15:21.601  6073  6073 I Termux:TerminalView: KeyEvent#getUnicodeChar(0) returned: 0
12-10 10:15:21.840  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=31, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_C, scanCode=46, metaState=META_CTRL_ON|META_CTRL_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22302069382000, downTime=22302069382000, deviceId=13, source=0x301, displayId=-1 })

and for left-Alt + f:

12-10 10:13:30.634  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=66, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ENTER, scanCode=28, metaState=0, flags=0x8, repeatCount=0, eventTime=22190868183000, downTime=22190797196000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:30.635  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=66, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ENTER, scanCode=28, metaState=0, flags=0x8, repeatCount=0, eventTime=22190868183000, downTime=22190797196000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:31.424  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=57, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_LEFT, scanCode=56, metaState=META_ALT_ON|META_ALT_LEFT_ON, flags=0x8, repeatCount=0, eventTime=22191651916000, downTime=22191651916000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:31.425  6073  6073 I Termux:TerminalView: onKeyDown(keyCode=57, isSystem()=false, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_ALT_LEFT, scanCode=56, metaState=META_ALT_ON|META_ALT_LEFT_ON, flags=0x8, repeatCount=0, eventTime=22191651916000, downTime=22191651916000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:31.425  6073  6073 I Termux:TerminalView: KeyEvent#getUnicodeChar(0) returned: 0
12-10 10:13:31.663  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=34, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_LEFT_ON, flags=0x8, repeatCount=0, eventTime=22191893021000, downTime=22191893021000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:31.664  6073  6073 I Termux:TerminalView: onKeyDown(keyCode=34, isSystem()=false, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_LEFT_ON, flags=0x8, repeatCount=0, eventTime=22191893021000, downTime=22191893021000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:31.664  6073  6073 I Termux:TerminalView: KeyEvent#getUnicodeChar(0) returned: 102
12-10 10:13:31.664  6073  6073 I Termux:TerminalView: inputCodePoint(codePoint=102, controlDownFromEvent=false, leftAltDownFromEvent=true)
12-10 10:13:31.812  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=34, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_LEFT_ON, flags=0x8, repeatCount=0, eventTime=22192040271000, downTime=22191893021000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:31.813  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=34, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_F, scanCode=33, metaState=META_ALT_ON|META_ALT_LEFT_ON, flags=0x8, repeatCount=0, eventTime=22192040271000, downTime=22191893021000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:32.050  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=57, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ALT_LEFT, scanCode=56, metaState=0, flags=0x8, repeatCount=0, eventTime=22192279764000, downTime=22191651916000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:32.050  6073  6073 I Termux:TerminalView: onKeyUp(keyCode=57, event=KeyEvent { action=ACTION_UP, keyCode=KEYCODE_ALT_LEFT, scanCode=56, metaState=0, flags=0x8, repeatCount=0, eventTime=22192279764000, downTime=22191651916000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:33.665  6073  6073 I Termux:TerminalView: onKeyPreIme(keyCode=114, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_CTRL_RIGHT, scanCode=97, metaState=META_CTRL_ON|META_CTRL_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22193889608000, downTime=22193889608000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:33.665  6073  6073 I Termux:TerminalView: onKeyDown(keyCode=114, isSystem()=false, event=KeyEvent { action=ACTION_DOWN, keyCode=KEYCODE_CTRL_RIGHT, scanCode=97, metaState=META_CTRL_ON|META_CTRL_RIGHT_ON, flags=0x8, repeatCount=0, eventTime=22193889608000, downTime=22193889608000, deviceId=13, source=0x301, displayId=-1 })
12-10 10:13:33.666  6073  6073 I Termux:TerminalView: KeyEvent#getUnicodeChar(0) returned: 0

The WindowOnBackDispatcher lines suggest that Android might be capturing this key combination somehow.

Incidentally, on the same Android machine, with the same physical keyboard, right-Alt works perfectly in termux-x11. So however it is handling that key, maybe termux-app could copy its behaviour.