Positron is copying large objects unnecessarily when working in the console

System details:

Positron and OS details:

Positron Version: 2025.05.0 (Universal) build 142
Code - OSS Version: 1.99.0
Commit: 17df8dd67df471d39688fc6cd02e3f23543b4d72
Date: 2025-05-05T15:42:05.662Z (3 wks ago)
Electron: 34.3.2
Chromium: 132.0.6834.210
Node.js: 20.18.3
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.4.0

Interpreter details:

R 4.5.0

Describe the issue:

Positron is copying large objects unnecessarily when working in the console

Steps to reproduce the issue:

Consider the following well behaved reprex which only results in the vector of 10 million values being copied once as expected.

library(lobstr)
x <- runif(10^8)
tracemem(x)
#> [1] "<0x300000000>"
y <- x
y[[1]] <- 1
#> tracemem[0x300000000 -> 0x32faf4000]:
y[[1]] <- 1

^{Created on 2025-05-28 with reprex v2.1.1}

But when I execute each line of code one at a time in the Positron console the vector is actually copied twice.

> x <- runif(10^8)
> tracemem(x)
[1] "<0x32faf4000>"
> y <- x
> y[[1]] <- 1
tracemem[0x32faf4000 -> 0x38f0dc000]: 
> y[[1]] <- 1
tracemem[0x38f0dc000 -> 0x300000000]: 

Expected or desired behavior:

The expected and in the case of large objects desired behaviour would for the object to only be copied once when the code is executed line by line in the console in Positron. I note that this behaviour also occurs in RStudio so may be unavoidable but it is certainly unexpected and undesirable.

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

No

Start by reproducing the issue in the Positron console with R 4.5.0 using the supplied lobstr and tracemem examples. Compare line-by-line console execution with the standalone reprex and trace the extra copy; done means the large vector is copied once in Positron without introducing errors.