Truncated / wrong prefix & suffix on large file Autocompletion

[ArifBS]

Before submitting your bug report

• I've tried using the "Ask AI" feature on the Continue docs site to see if the docs have an answer
• I'm not able to find a related conversation on GitHub discussions that reports the same bug
• I'm not able to find an open issue that reports the same bug
• I've seen the troubleshooting guide on the Continue Docs

Relevant environment info

- OS: Linux Ubuntu
- Continue version: 1.0.67
- IDE version: Intellij Idea 2026.1.1
- Model: Deepseek v4 flash & codestral
- config:
  

  - name: DeepSeek Autocompletion
    provider: deepseek
    model: deepseek-v4-flash
    apiBase: https://api.deepseek.com
    apiKey: sk-xxxxx
    defaultCompletionOptions:
      contextLength: 128000
      maxTokens: 256
    autocompleteOptions:
      debounceDelay: 350
      maxPromptTokens: 8192
      prefixPercentage: 0.5
      maxSuffixPercentage: 0.5
      multilineCompletions: true


  
  OR link to agent in Continue hub:

Description

Hello,

The autocompletion is working fine on small file (tens or hundreds of lines) but failing on larger file (more than 3000 lines).
On the larger file, it show suggestion that totally wrong and when I move the cursor into another place it still show that same wrong suggestion.

Digging the prompt.log I found that the prefix and suffix are incorrect. Doesn't matter where the cursor is, it get the same wrong prefix & suffix.

here is the log on small and large file.

prompt_correct.log
prompt_wrong.log

Note:

• The vscode plugin works fine using the same yaml configuration.

thanks
ArifBS

To reproduce

No response

Log output

[praneethb7]

Hi @ArifBS, I've opened a PR (#12399) that should fix this.

Root cause: the JetBrains plugin was capping file reads at 100,000 characters.
For large files this truncated the content from line 0, so the prefix/suffix
was always wrong regardless of cursor position.

The fix passes the full in-memory editor content directly with each autocomplete
request, mirroring what the VS Code extension already does.

Could you test it once it's merged and confirm it resolves the issue for you?

[ArifBS]

Hello @praneethb7

Unfortunately the updated plugin (v 1.0.68) doesn't even load. The continue browser also blank. Here is the error log after it updated.

Unhandled exception in Dispatchers.IO

com.intellij.openapi.diagnostic.UnhandledException: /home/arifbs/.local/share/JetBrains/IntelliJIdea2026.1/continue-intellij-extension/core/linux-x64/continue-binary
	at com.intellij.openapi.application.impl.ExceptionsKt.processUnhandledException(exceptions.kt:55)
	at com.intellij.openapi.application.impl.CoroutineExceptionHandlerImpl.handleException(CoroutineExceptionHandlerImpl.kt:27)
	at kotlinx.coroutines.internal.CoroutineExceptionHandlerImpl_commonKt.handleUncaughtCoroutineException(CoroutineExceptionHandlerImpl.common.kt:34)
	at kotlinx.coroutines.CoroutineExceptionHandlerKt.handleCoroutineException(CoroutineExceptionHandler.kt:31)
	at kotlinx.coroutines.StandaloneCoroutine.handleJobException(Builders.common.kt:192)
	at kotlinx.coroutines.JobSupport.finalizeFinishingState(JobSupport.kt:229)
	at kotlinx.coroutines.JobSupport.tryMakeCompletingSlowPath(JobSupport.kt:953)
	at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:901)
	at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:866)
	at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:99)
	at kotlinx.coroutines.debug.internal.DebugProbesImpl$CoroutineOwner.resumeWith(DebugProbesImpl.kt:545)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.internal.SoftLimitedDispatcher$Worker.run(SoftLimitedDispatcher.kt:130)
	at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:610)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:1188)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:775)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:762)
Caused by: java.nio.file.NoSuchFileException: /home/arifbs/.local/share/JetBrains/IntelliJIdea2026.1/continue-intellij-extension/core/linux-x64/continue-binary
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:94)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:108)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:114)
	at java.base/sun.nio.fs.UnixFileAttributeViews$Posix.setMode(UnixFileAttributeViews.java:228)
	at java.base/sun.nio.fs.UnixFileAttributeViews$Posix.setPermissions(UnixFileAttributeViews.java:281)
	at java.base/java.nio.file.Files.setPosixFilePermissions(Files.java:1988)
	at com.github.continuedev.continueintellijextension.continue.process.ContinueBinaryProcess$Companion.elevatePermissions(ContinueBinaryProcess.kt:82)
	at com.github.continuedev.continueintellijextension.continue.process.ContinueBinaryProcess$Companion.setPermissions(ContinueBinaryProcess.kt:65)
	at com.github.continuedev.continueintellijextension.continue.process.ContinueBinaryProcess$Companion.access$setPermissions(ContinueBinaryProcess.kt:58)
	at com.github.continuedev.continueintellijextension.continue.process.ContinueBinaryProcess$startBinaryProcess$1.invokeSuspend(ContinueBinaryProcess.kt:33)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
	... 7 more
	Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelled}@1d6e9cea, Dispatchers.IO]

I also tried to remove the old plugin first and fresh install the updated plugin with same failure result,
please advise

Thanks

[praneethb7]

Hi @ArifBS, thanks for testing and reporting back!

The error you're seeing is actually unrelated to this PR. My PR hasn't been
merged yet, v1.0.68 is the current marketplace version which doesn't contain
any of our changes.

The error points to ContinueBinaryProcess.kt → elevatePermissions() which
handles binary file permissions at startup. Our changes only touch the
autocomplete request building (ContinueCompletionService.kt and
ContinueInlineCompletionProvider.kt) completely separate code paths.

The continue-binary file is missing from your installation, which is a
packaging/download issue with v1.0.68 itself. You could try:

1. Uninstall the plugin completely
2. Restart IntelliJ
3. Reinstall from the marketplace and let it fully download

Once this PR is merged and released, you'd be able to test the actual
autocomplete fix. For the binary issue, it might be worth raising a separate
bug report.