Alt arrow keys print extra characters #3101

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1. ghost added

   Needs-TriageIt's a new issue that the core contributor team needs to triage at the next triage meetingIt's a new issue that the core contributor team needs to triage at the next triage meeting

   on Oct 7, 2019
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3. rideron89 commented on Oct 7, 2019

   

   Ron Rider (rideron89)

   on Oct 7, 2019

   Last edited by rideron89

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   I'm having the same issue. Happens in both fish and bash.

   I use alt-left and alt-right to navigate through words on a command.

   Terminal version: 0.5.2762.0
   Windows 10 version 18362.388 (1903)
4. DHowett-MSFT commented on Oct 7, 2019

   

   Dustin L. Howett (MSFT) (DHowett-MSFT)

   on Oct 7, 2019

   Contributor

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   Confirmed! Possible regression from #2836 (/cc Leonard Hecker (@lhecker))?
5. Dustin L. Howett (MSFT) (DHowett-MSFT)

   added

   Area-InputRelated to input processing (key presses, mouse, etc.)Related to input processing (key presses, mouse, etc.)

   Area-TerminalControlIssues pertaining to the terminal control (input, selection, keybindings, mouse interaction, etc.)Issues pertaining to the terminal control (input, selection, keybindings, mouse interaction, etc.)

   Issue-BugIt either shouldn't be doing this or needs an investigation.It either shouldn't be doing this or needs an investigation.

   Product-TerminalThe new Windows Terminal.The new Windows Terminal.

   on Oct 7, 2019
6. ghost removed

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7. Dustin L. Howett (MSFT) (DHowett-MSFT)

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   Needs-TriageIt's a new issue that the core contributor team needs to triage at the next triage meetingIt's a new issue that the core contributor team needs to triage at the next triage meeting

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9. Dustin L. Howett (MSFT) (DHowett-MSFT)

   added this to the Terminal-1910 milestone on Oct 7, 2019
10. lhecker commented on Oct 8, 2019

    

    Leonard Hecker (lhecker)

    on Oct 8, 2019

    Member

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    Dustin L. Howett (MSFT) (@DHowett-MSFT) This issue is caused by the use of ToUnicodeEx(), which has the following warning...

    As ToUnicodeEx translates the virtual-key code, it also changes the state of the kernel-mode keyboard buffer. This state-change affects dead keys, ligatures, alt+numpad key entry, and so on. It might also cause undesired side-effects if used in conjunction with TranslateMessage (which also changes the state of the kernel-mode keyboard buffer).

    I'll open a PR.

    paulwhiting I was not able to exactly replicate your observed behavior. Is there a way to switch between "keypad mode" on/off? I'm "Press[ing] alt-up, alt-down, alt-right, alt-left" (in that order) and I'm not really certain why I'm getting these different results:

    • C:\Windows\System32\bash.exe: Alt+Up/Down causes a beep (or "bing") and Alt+Left/Right jumps between words
    • Terminal App powershell: ◘☻♠♦ is printed out.
    • Terminal App ubuntu: ♦◘☻♠ is printed out.
11. ghost added

    In-PRThis issue has a related PRThis issue has a related PR

    on Oct 8, 2019
12. paulwhiting commented on Oct 9, 2019

    

    paulwhiting

    on Oct 9, 2019

    Last edited by paulwhiting

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    I believe num lock should do what you want? My keyboard doesn't have a numeric keypad, just standalone arrow keys. You're not seeing the ABCD characters because your underlying shell is handling those. It's the extra one of ♦◘☻♠ that pops up after letting go of alt that's the problem.
13. davy-tw commented on Oct 15, 2019

    

    Davy (davy-tw)

    on Oct 15, 2019

    Last edited by davy-tw

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    In my case, the extra keystroke will happens when I "release the Alt key" after pressing Alt+Left/Right/Up/Down.
    If I don't release Alt key, the control key \cA \cB \cC \cD won't come out.
14. sivaramn commented on Oct 21, 2019

    

    sivaramn

    on Oct 21, 2019

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    can confirm, I too face this. Within tmux, if i switch panes using Alt+direction keys, i get funny chars on the command line

    👍React with 👍3Reacted by BourneLoser, Tony Lykke and Vincent Vermilya
15. Kayla Cinnamon (cinnamon-msft)

    modified the milestones: Terminal-1910, Terminal-1911 on Oct 24, 2019
16. daveshih01 commented on Nov 13, 2019

    

    daveshih01

    on Nov 13, 2019

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    Hi folks, sorry for stating the obvious. Please review/approve the PR so this can be addressed. Thanks!
17. Mike Griese (zadjii-msft)

    closed this as completedin #3117on Nov 13, 2019
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20. ghost added

    Resolution-Fix-CommittedFix is checked in, but it might be 3-4 weeks until a release.Fix is checked in, but it might be 3-4 weeks until a release.

    on Nov 13, 2019
21. Mike Griese (zadjii-msft)

    added a commit that references this issue on Nov 13, 2019

    Fixed #3101: Alt+Arrow-Keys print extra characters (#3117)

    ...

    This issue will close once commit c9f148c is merged into the 'main' branch.

    c9f148c
22. daveshih01 commented on Nov 14, 2019

    

    daveshih01

    on Nov 14, 2019

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    Thanks, everyone!