Text gets truncated when pasting or typing large content into the prompt field

[jalpizarTechnosoft]

Title: Text gets truncated when pasting or typing large content into the prompt field
Description:
When entering text into the "Prompt / Paste Image" input field (top panel), the content sent to the Claude Code console (bottom panel) sometimes arrives incomplete/truncated. The full prompt is never fully received by the Claude Code CLI.
Steps to Reproduce:

Open the Claude Code Extension panel in Visual Studio 2022
Either paste a large block of copied text or manually type a long prompt into the input field
Press Enter to submit
Observe the text received in the Claude Code console below

Expected Behavior:
The full content should be transmitted to the Claude Code console exactly as entered.
Actual Behavior:
The text is cut off — only a partial portion reaches the console. The truncation point appears to be non-deterministic (doesn't always cut at the same place).
Reproducibility:
Intermittent — no consistent pattern identified yet. It occurs sporadically across different input methods (paste and manual typing).
Environment:

Extension: Claude Code Extension for Visual Studio by Daniel Carvalho Liedke
IDE: Visual Studio 2022
Claude Code version: v2.1.132
Model: Sonnet 4.6 · Claude Team

Additional Context:
Unable to determine a reliable reproduction path. No specific character threshold or character type has been identified as a trigger. It occurs sporadically.
If helpful for debugging, consider adding input length logging on both ends (prompt field dispatch and console receive) to capture the delta when truncation occurs. Possible root causes to investigate: input stream buffer size limit, async write race condition, or newline/encoding handling during input events.

[dliedke]

I hope this is fixed for Version 10.46

[jalpizarTechnosoft]

Here i am again, still happen the truncate situation, i'm going to explain exactly how it happens (explained in detail by Claude hehe)

Title: Multi-line pasted text gets truncated on Enter — only last text fragment is sent
Extension version: Claude Code Extension for Visual Studio by Daniel Carvalho Liedke
VS Version: Visual Studio 2022
Description:
When pasting a large multi-line prompt (copied from an external text editor such as Notepad) into the extension's prompt input field, pressing Enter to submit does not send the full pasted content. Instead, only the last text fragment or partial sentence is transmitted to the chat.
The issue does not occur 100% of the time, but reproduces consistently enough to impact normal workflow. Notably, the same text that triggered the bug in one chat session reproduced the exact same truncation behavior in a brand new chat session, ruling out chat history or session state as contributing factors. This suggests the content or structure of the pasted text itself may be the trigger.
Steps to Reproduce:

Write a multi-line prompt in an external editor (e.g., Notepad) with multiple paragraphs
Select all and copy the entire text
Paste into the extension's prompt input field (full text appears correctly in the input)
Press Enter to submit
(Reproducible with the same text across both existing and brand new chat sessions)

Expected behavior: The complete pasted text is sent as the prompt to Claude.
Actual behavior: Only the last partial sentence or fragment is submitted. The rest is silently discarded. Claude responds only to that truncated fragment with no indication that data was lost.
Attached evidence:

img_1.png — Full intended prompt in Notepad; the only fragment that was actually transmitted is highlighted in red
img_2.png — Full text correctly visible in the input field after paste
img_3.png — After pressing Enter, only the highlighted fragment was sent; Claude's response confirms it received incomplete input
Prompt_Truncated.txt — The exact text file used to reproduce the issue, provided so the maintainer can attempt reproduction with identical input

Additional context:
There is no warning or visual feedback indicating truncation — the input appears to accept the full text normally, making this particularly hard to catch. The bug was reproduced with identical input on both a session with existing history and a completely new chat, confirming the issue is tied to the input/submit mechanism rather than session state.
A possible root cause may be in how the Enter keydown event handler reads the input content — it may be capturing only the last text node or active line in a contenteditable div rather than the full content.

[Prompt_Truncated.txt](https://github.com/user-attachments/files/27538959/Prompt_Truncated.txt)

[dliedke]

Please send txt file by email to dliedke@gmail.com

[dliedke]

I can't reproduce it here

[dliedke]

Attached or detached

[dliedke]

I am wokring on a fix but it will be slower to paste the text

[dliedke]

It is too slow, not sure if this is a good idea

[dliedke]

Did you try with windows terminal? and detached console?

[dliedke]

ClaudeCodeExtension.zip

This version uses CTRL+ENTER for each line, you may try. It is slow but maybe it will work for you. I don't plan to release this version.