Quarto inline output does not capture incremental base R plot layers

Description
When Quarto inline output is enabled in Positron, additions to an existing
base R plot are not displayed in the inline output.

The first plotting command appears, but later commands like points(),
lines(), and curve(..., add = TRUE) don't appear.

Example

I created a Quarto .qmd file with this R code chunk:

y <- 2 * c(1, 2, 3, 4, 5)
x <- c(1, 2, 3, 4, 5)

plot(y ~ x)
points(3, 9, col = "red", pch = 16, cex = 2)

I then ran the entire code chunk with inline output enabled.

Expected result

The graph should contain:

• Five points from plot(y ~ x)
• One additional large red point at x = 3, y = 9

Actual result

The initial plot appears, but the point added by points() does not appear
in the inline output.

The same problem occurs with this example:

curve(exp(-x), from = 0, to = 4, lty = 2)
curve(exp(-x^2), add = TRUE)

Only the first curve shows up. The second curve is not layered at all.

Additional information
Rendering the complete Quarto document works. So it's just the inline output as far as I can tell.

A single completed ggplot2 object displays correctly.

Environment

• Positron Version: 2026.08.0 build 331
• Code - OSS Version: 1.124.0
• Commit: a3a370d4187484ce962794408c76dab702978eaf
• Date: 2026-08-05T17:02:37-07:00
• Electron: 42.2.0
• Chromium: 148.0.7778.97
• Node.js: 24.15.0
• V8: 14.8.178.14-electron.0
• OS: Darwin arm64 25.5.0
• R version: 4.5.3
• Quarto inline output: enabled

Start by reproducing the examples in a Quarto .qmd file with inline output enabled, then compare the inline result with a complete document render. Check how Positron captures successive base R plotting commands; done means points(), lines(), and curve(..., add = TRUE) appear alongside the initial plot.