Failed to handle key `<down>`: Cannot read properties of undefined (reading 'lineAt')
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Description
To Reproduce
Steps to reproduce the behavior:
- Go to '...'
- Click on '....'
- Scroll down to '....'
- See error
VSCodeVim version: 1.21.18
Stack trace
TypeError: Failed to handle key `<down>`: Cannot read properties of undefined (reading 'lineAt')
at Po.isLineEnd (c:\Users\adels\.vscode\extensions\vscodevim.vim-1.30.1\out\extension.js:2:766614)
at map (c:\Users\adels\.vscode\extensions\vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18\src\mode\modeHandler.ts:811:22)
at Array.map (<anonymous>)
at D.actionToRecord [as runAction] (c:\Users\adels\.vscode\extensions\vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18\src\mode\modeHandler.ts:808:53)
at D.handledAsAction [as handleKeyAsAnAction] (c:\Users\adels\.vscode\extensions\vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18\src\mode\modeHandler.ts:664:43)
at D.mh [as handleKeyEvent] (c:\Users\adels\.vscode\extensions\vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18\src\mode\modeHandler.ts:477:11)
at r (c:\Users\adels\.vscode\extensions\vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18\extensionBase.ts:512:15)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with src/mode/modeHandler.ts around lines 808-811, where the action is mapped, and compare that path with the reported isLineEnd stack trace. Reproduce the error with VSCodeVim 1.21.18 and verify that handling no longer raises the undefined lineAt exception.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript, vscode
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100