Cannot scroll within multiline statements in R Console

System details:

Positron and OS details:

Positron Version: 2025.08.0 (system setup) build 108
Code - OSS Version: 1.102.0
Commit: 2ae1981311adc4d035e117cf2d1cdf164b5b8ae8
Date: 2025-07-30T04:07:37.599Z
Electron: 35.6.0
Chromium: 134.0.6998.205
Node.js: 22.15.1
V8: 13.4.114.21-electron.0
OS: Windows_NT x64 10.0.26100

Session details:

New R session (R 4.5.1)

Describe the issue:

When entering a multiline statement in the console (e.g., using { or a function definition), I cannot scroll through the input if it spans multiple lines. This makes it difficult to review or edit long inputs directly in the console. It also means you cannot scroll up to view earlier statements in your history. Scrolling with (or on) the scrollbar does work as expected.

https://github.com/user-attachments/assets/1603867b-1e82-4404-913d-24d4d42528dd

Steps to reproduce the issue:

1. Start a new R session Positron and open the console.
2. Type a multiline command, such as:

> data.frame(
+ 
+ 
+
+
+
+
+
+ 
)

3. Try scrolling up or down within the statement before completing the command.

Expected or desired behavior:

I expect to be able to scroll through the in-progress input or go to earlier commands so I can read or edit earlier lines of the statement.

Were there any error messages in the UI, Output panel, or Developer Tools console?

No

Start by reproducing the issue in a new R session using the multiline data.frame example, then inspect the R Console input and history scrolling entry points. Confirm whether scrolling fails only for in-progress multiline input or also for earlier history. Done means the relevant console content can be reviewed and edited by scrolling before the statement is completed.